129895631 has 2 divisors, whose sum is σ = 129895632. Its totient is φ = 129895630.

The previous prime is 129895603. The next prime is 129895637. The reversal of 129895631 is 136598921.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129895631 is a prime.

It is a super-2 number, since 2×129895631² = 33745749905776322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129895637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64947815 + 64947816.

It is an arithmetic number, because the mean of its divisors is an integer number (64947816).

Almost surely, 2^129895631 is an apocalyptic number.

129895631 is a deficient number, since it is larger than the sum of its proper divisors (1).

129895631 is an equidigital number, since it uses as much as digits as its factorization.

129895631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 44.

The square root of 129895631 is about 11397.1764485771. The cubic root of 129895631 is about 506.4440983915. Note that the first 3 decimals are identical.

The spelling of 129895631 in words is "one hundred twenty-nine million, eight hundred ninety-five thousand, six hundred thirty-one".