634857860431 has 4 divisors (see below), whose sum is σ = 634861258312. Its totient is φ = 634854462552.

The previous prime is 634857860407. The next prime is 634857860467. The reversal of 634857860431 is 134068758436.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 634857860431 - 2⁹ = 634857859919 is a prime.

It is a super-2 number, since 2×634857860431² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (634857867431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401300 + ... + 1798153.

It is an arithmetic number, because the mean of its divisors is an integer number (158715314578).

Almost surely, 2^634857860431 is an apocalyptic number.

634857860431 is a deficient number, since it is larger than the sum of its proper divisors (3397881).

634857860431 is a wasteful number, since it uses less digits than its factorization.

634857860431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3397880.

The product of its (nonzero) digits is 11612160, while the sum is 55.

The spelling of 634857860431 in words is "six hundred thirty-four billion, eight hundred fifty-seven million, eight hundred sixty thousand, four hundred thirty-one".