681526881 has 24 divisors (see below), whose sum is σ = 1141859264. Its totient is φ = 383628960.

The previous prime is 681526849. The next prime is 681526907. The reversal of 681526881 is 188625186.

It is not a de Polignac number, because 681526881 - 2⁵ = 681526849 is a prime.

It is a super-2 number, since 2×681526881² = 928957779051176322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (681516881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76510 + ... + 84951.

Almost surely, 2^681526881 is an apocalyptic number.

It is an amenable number.

681526881 is a deficient number, since it is larger than the sum of its proper divisors (460332383).

681526881 is a wasteful number, since it uses less digits than its factorization.

681526881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161541 (or 161538 counting only the distinct ones).

The product of its digits is 184320, while the sum is 45.

The square root of 681526881 is about 26106.0698114442. The cubic root of 681526881 is about 880.0236223859.

The spelling of 681526881 in words is "six hundred eighty-one million, five hundred twenty-six thousand, eight hundred eighty-one".