681427531 has 8 divisors (see below), whose sum is σ = 689120784. Its totient is φ = 673777440.

The previous prime is 681427499. The next prime is 681427553. The reversal of 681427531 is 135724186.

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

It is a cyclic number.

It is not a de Polignac number, because 681427531 - 2⁵ = 681427499 is a prime.

It is a super-2 number, since 2×681427531² = 928686960009511922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681427931) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21501 + ... + 42721.

It is an arithmetic number, because the mean of its divisors is an integer number (86140098).

Almost surely, 2^681427531 is an apocalyptic number.

681427531 is a deficient number, since it is larger than the sum of its proper divisors (7693253).

681427531 is a wasteful number, since it uses less digits than its factorization.

681427531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21581.

The product of its digits is 40320, while the sum is 37.

The square root of 681427531 is about 26104.1669279064. The cubic root of 681427531 is about 879.9808583130.

The spelling of 681427531 in words is "six hundred eighty-one million, four hundred twenty-seven thousand, five hundred thirty-one".