31481690 has 16 divisors (see below), whose sum is σ = 56798280. Its totient is φ = 12563520.

The previous prime is 31481683. The next prime is 31481701. The reversal of 31481690 is 9618413.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 23319241 + 8162449 = 4829^2 + 2857^2 .

It is a super-2 number, since 2×31481690² = 1982193610512200, which contains 22 as substring.

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, 1196 + ... + 8024.

Almost surely, 2^31481690 is an apocalyptic number.

31481690 is a deficient number, since it is larger than the sum of its proper divisors (25316590).

31481690 is a wasteful number, since it uses less digits than its factorization.

31481690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7297.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 31481690 is about 5610.8546586059. The cubic root of 31481690 is about 315.7567762003.

The spelling of 31481690 in words is "thirty-one million, four hundred eighty-one thousand, six hundred ninety".