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195891139 = 319076967
BaseRepresentation
bin10111010110100…
…00111111000011
3111122121022010101
423223100333003
5400122004024
631234343231
74566022123
oct1353207703
9448538111
10195891139
11a0636a04
125572ab17
1331779022
141c032c83
15122e6c44
hexbad0fc3

195891139 has 8 divisors (see below), whose sum is σ = 202462208. Its totient is φ = 189335880.

The previous prime is 195891109. The next prime is 195891173. The reversal of 195891139 is 931198591.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 195891139 - 25 = 195891107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (195891109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24634 + ... + 31600.

It is an arithmetic number, because the mean of its divisors is an integer number (25307776).

Almost surely, 2195891139 is an apocalyptic number.

195891139 is a deficient number, since it is larger than the sum of its proper divisors (6571069).

195891139 is an equidigital number, since it uses as much as digits as its factorization.

195891139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7905.

The product of its digits is 87480, while the sum is 46.

The square root of 195891139 is about 13996.1115671461. Note that the first 3 decimals coincide. The cubic root of 195891139 is about 580.7710108850.

The spelling of 195891139 in words is "one hundred ninety-five million, eight hundred ninety-one thousand, one hundred thirty-nine".

Divisors: 1 31 907 6967 28117 215977 6319069 195891139