681630531 has 8 divisors (see below), whose sum is σ = 923739984. Its totient is φ = 446970720.

The previous prime is 681630527. The next prime is 681630533. The reversal of 681630531 is 135036186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 681630531 - 2² = 681630527 is a prime.

It is a super-2 number, since 2×681630531² = 929240361582683922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681630492 and 681630501.

It is not an unprimeable number, because it can be changed into a prime (681630533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1862196 + ... + 1862561.

It is an arithmetic number, because the mean of its divisors is an integer number (115467498).

Almost surely, 2^681630531 is an apocalyptic number.

681630531 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

681630531 is a deficient number, since it is larger than the sum of its proper divisors (242109453).

681630531 is a wasteful number, since it uses less digits than its factorization.

681630531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3724821.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 681630531 is about 26108.0549064843. The cubic root of 681630531 is about 880.0682329152.

The spelling of 681630531 in words is "six hundred eighty-one million, six hundred thirty thousand, five hundred thirty-one".