684536831 has 4 divisors (see below), whose sum is σ = 746767464. Its totient is φ = 622306200.

The previous prime is 684536771. The next prime is 684536837. The reversal of 684536831 is 138635486.

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-684536831 is a prime.

It is a super-2 number, since 2×684536831² = 937181345991045122, which 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 (684536837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31115300 + ... + 31115321.

It is an arithmetic number, because the mean of its divisors is an integer number (186691866).

Almost surely, 2^684536831 is an apocalyptic number.

684536831 is a deficient number, since it is larger than the sum of its proper divisors (62230633).

684536831 is a wasteful number, since it uses less digits than its factorization.

684536831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62230632.

The product of its digits is 414720, while the sum is 44.

The square root of 684536831 is about 26163.6547714573. The cubic root of 684536831 is about 881.3172554609.

The spelling of 684536831 in words is "six hundred eighty-four million, five hundred thirty-six thousand, eight hundred thirty-one".