31681090 has 16 divisors (see below), whose sum is σ = 65172672. Its totient is φ = 10862064.

The previous prime is 31681057. The next prime is 31681103. The reversal of 31681090 is 9018613.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226224 + ... + 226363.

It is an arithmetic number, because the mean of its divisors is an integer number (4073292).

Almost surely, 2^31681090 is an apocalyptic number.

31681090 is an abundant number, since it is smaller than the sum of its proper divisors (33491582).

31681090 is a wasteful number, since it uses less digits than its factorization.

31681090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452601.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 31681090 is about 5628.5957396139. The cubic root of 31681090 is about 316.4220246538.

It can be divided in two parts, 316 and 81090, that added together give a triangular number (81406 = T₄₀₃).

The spelling of 31681090 in words is "thirty-one million, six hundred eighty-one thousand, ninety".