871254121631 has 2 divisors, whose sum is σ = 871254121632. Its totient is φ = 871254121630.

The previous prime is 871254121603. The next prime is 871254121697. The reversal of 871254121631 is 136121452178.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 871254121631 - 2³⁰ = 870180379807 is a prime.

It is a super-2 number, since 2×871254121631² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (871254121601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 435627060815 + 435627060816.

It is an arithmetic number, because the mean of its divisors is an integer number (435627060816).

Almost surely, 2^871254121631 is an apocalyptic number.

871254121631 is a deficient number, since it is larger than the sum of its proper divisors (1).

871254121631 is an equidigital number, since it uses as much as digits as its factorization.

871254121631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 41.

The spelling of 871254121631 in words is "eight hundred seventy-one billion, two hundred fifty-four million, one hundred twenty-one thousand, six hundred thirty-one".