31681089 has 12 divisors (see below), whose sum is σ = 49921872. Its totient is φ = 19200600.

The previous prime is 31681057. The next prime is 31681103. The reversal of 31681089 is 98018613.

It is not a de Polignac number, because 31681089 - 2⁵ = 31681057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31681589) 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, 159907 + ... + 160104.

It is an arithmetic number, because the mean of its divisors is an integer number (4160156).

Almost surely, 2^31681089 is an apocalyptic number.

It is an amenable number.

31681089 is a deficient number, since it is larger than the sum of its proper divisors (18240783).

31681089 is a wasteful number, since it uses less digits than its factorization.

31681089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320028 (or 320025 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 31681089 is about 5628.5956507818. The cubic root of 31681089 is about 316.4220213245.

The spelling of 31681089 in words is "thirty-one million, six hundred eighty-one thousand, eighty-nine".