681996051 has 48 divisors (see below), whose sum is σ = 1169123200. Its totient is φ = 391541040.

The previous prime is 681996037. The next prime is 681996061. The reversal of 681996051 is 150699186.

681996051 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 681996051 - 2⁹ = 681995539 is a prime.

It is a super-2 number, since 2×681996051² = 930237227159189202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 681995988 and 681996006.

It is not an unprimeable number, because it can be changed into a prime (681996011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 56580 + ... + 67566.

Almost surely, 2^681996051 is an apocalyptic number.

681996051 is a deficient number, since it is larger than the sum of its proper divisors (487127149).

681996051 is a wasteful number, since it uses less digits than its factorization.

681996051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11037 (or 11020 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 45.

The square root of 681996051 is about 26115.0541067791. The cubic root of 681996051 is about 880.2255151196.

The spelling of 681996051 in words is "six hundred eighty-one million, nine hundred ninety-six thousand, fifty-one".