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142831031 = 73416417
BaseRepresentation
bin10001000001101…
…10110110110111
3100221202120100012
420200312312313
5243031043111
622101210435
73353021000
oct1040666667
9327676305
10142831031
1173696082
123ba00a1b
132378bb05
1414d801a7
15c81548b
hex8836db7

142831031 has 8 divisors (see below), whose sum is σ = 166567200. Its totient is φ = 122426304.

The previous prime is 142831021. The next prime is 142831067. The reversal of 142831031 is 130138241.

It is not a de Polignac number, because 142831031 - 26 = 142830967 is a prime.

It is a super-2 number, since 2×1428310312 = 40801406833045922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 142830988 and 142831006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (142831021) 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, 207866 + ... + 208551.

It is an arithmetic number, because the mean of its divisors is an integer number (20820900).

Almost surely, 2142831031 is an apocalyptic number.

142831031 is a deficient number, since it is larger than the sum of its proper divisors (23736169).

142831031 is an frugal number, since it uses more digits than its factorization.

142831031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 416438 (or 416424 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 142831031 is about 11951.1937060697. The cubic root of 142831031 is about 522.7261062113.

Adding to 142831031 its reverse (130138241), we get a palindrome (272969272).

The spelling of 142831031 in words is "one hundred forty-two million, eight hundred thirty-one thousand, thirty-one".

Divisors: 1 7 49 343 416417 2914919 20404433 142831031