681003621 has 12 divisors (see below), whose sum is σ = 996124480. Its totient is φ = 448255080.

The previous prime is 681003613. The next prime is 681003623. The reversal of 681003621 is 126300186.

It is not a de Polignac number, because 681003621 - 2³ = 681003613 is a prime.

It is a super-2 number, since 2×681003621² = 927531863630223282, 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 (681003623) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 478195 + ... + 479616.

Almost surely, 2^681003621 is an apocalyptic number.

It is an amenable number.

681003621 is a deficient number, since it is larger than the sum of its proper divisors (315120859).

681003621 is a wasteful number, since it uses less digits than its factorization.

681003621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957896 (or 957893 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 681003621 is about 26096.0460798183. The cubic root of 681003621 is about 879.7983443753.

The spelling of 681003621 in words is "six hundred eighty-one million, three thousand, six hundred twenty-one".