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139315991 = 2341157941
BaseRepresentation
bin10000100110111…
…00101100010111
3100201010222121112
420103130230113
5241131102431
621454005235
73311111033
oct1023345427
9321128545
10139315991
1171705191
123a7a681b
1322b2abc9
14147071c3
15c36dc2b
hex84dcb17

139315991 has 16 divisors (see below), whose sum is σ = 150026688. Its totient is φ = 129043200.

The previous prime is 139315949. The next prime is 139315997. The reversal of 139315991 is 199513931.

139315991 = T1 + T2 + ... + T941.

139315991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

139315991 is a nontrivial binomial coefficient, being equal to C(943, 3).

It is a cyclic number.

It is not a de Polignac number, because 139315991 - 214 = 139299607 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139315997) by changing a digit.

It is the 941-st tetrahedral number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147581 + ... + 148521.

It is an arithmetic number, because the mean of its divisors is an integer number (9376668).

Almost surely, 2139315991 is an apocalyptic number.

139315991 is a deficient number, since it is larger than the sum of its proper divisors (10710697).

139315991 is a wasteful number, since it uses less digits than its factorization.

139315991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1162.

The product of its digits is 32805, while the sum is 41.

The square root of 139315991 is about 11803.2195184195. The cubic root of 139315991 is about 518.4023833413.

The spelling of 139315991 in words is "one hundred thirty-nine million, three hundred fifteen thousand, nine hundred ninety-one".

Divisors: 1 23 41 157 941 943 3611 6437 21643 38581 147737 148051 887363 3397951 6057217 139315991