684793131 has 64 divisors (see below), whose sum is σ = 1064534016. Its totient is φ = 387763200.

The previous prime is 684793121. The next prime is 684793141. The reversal of 684793131 is 131397486.

It is an interprime number because it is at equal distance from previous prime (684793121) and next prime (684793141).

It is not a de Polignac number, because 684793131 - 2¹⁷ = 684662059 is a prime.

It is a super-2 number, since 2×684793131² = 937883264529566322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (684793121) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 6648426 + ... + 6648528.

It is an arithmetic number, because the mean of its divisors is an integer number (16633344).

Almost surely, 2^684793131 is an apocalyptic number.

684793131 is a deficient number, since it is larger than the sum of its proper divisors (379740885).

684793131 is a wasteful number, since it uses less digits than its factorization.

684793131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312.

The product of its digits is 108864, while the sum is 42.

The square root of 684793131 is about 26168.5523290839. The cubic root of 684793131 is about 881.4272341682.

The spelling of 684793131 in words is "six hundred eighty-four million, seven hundred ninety-three thousand, one hundred thirty-one".