684252931 has 4 divisors (see below), whose sum is σ = 698811552. Its totient is φ = 669694312.

The previous prime is 684252911. The next prime is 684252979. The reversal of 684252931 is 139252486.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-684252931 is a prime.

It is a super-2 number, since 2×684252931² = 936404147164181522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684252911) 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, 7279240 + ... + 7279333.

It is an arithmetic number, because the mean of its divisors is an integer number (174702888).

Almost surely, 2^684252931 is an apocalyptic number.

684252931 is a deficient number, since it is larger than the sum of its proper divisors (14558621).

684252931 is a wasteful number, since it uses less digits than its factorization.

684252931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14558620.

The product of its digits is 103680, while the sum is 40.

The square root of 684252931 is about 26158.2287435522. The cubic root of 684252931 is about 881.1954015031.

The spelling of 684252931 in words is "six hundred eighty-four million, two hundred fifty-two thousand, nine hundred thirty-one".