31481961 has 12 divisors (see below), whose sum is σ = 48829392. Its totient is φ = 17989608.

The previous prime is 31481951. The next prime is 31481981. The reversal of 31481961 is 16918413.

It is not a de Polignac number, because 31481961 - 2⁹ = 31481449 is a prime.

It is a super-2 number, since 2×31481961² = 1982227736811042, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (31481911) 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, 106935 + ... + 107228.

It is an arithmetic number, because the mean of its divisors is an integer number (4069116).

Almost surely, 2^31481961 is an apocalyptic number.

It is an amenable number.

31481961 is a deficient number, since it is larger than the sum of its proper divisors (17347431).

31481961 is a wasteful number, since it uses less digits than its factorization.

31481961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214180 (or 214173 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 31481961 is about 5610.8788081726. The cubic root of 31481961 is about 315.7576822279.

The spelling of 31481961 in words is "thirty-one million, four hundred eighty-one thousand, nine hundred sixty-one".