31481917 has 16 divisors (see below), whose sum is σ = 35176320. Its totient is φ = 28036800.

The previous prime is 31481911. The next prime is 31481921. The reversal of 31481917 is 71918413.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31481917 is a prime.

It is a super-2 number, since 2×31481917² = 1982222195989778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31481911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26067 + ... + 27247.

It is an arithmetic number, because the mean of its divisors is an integer number (2198520).

Almost surely, 2^31481917 is an apocalyptic number.

It is an amenable number.

31481917 is a deficient number, since it is larger than the sum of its proper divisors (3694403).

31481917 is a wasteful number, since it uses less digits than its factorization.

31481917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284.

The product of its digits is 6048, while the sum is 34.

The square root of 31481917 is about 5610.8748872168. The cubic root of 31481917 is about 315.7575351242.

The spelling of 31481917 in words is "thirty-one million, four hundred eighty-one thousand, nine hundred seventeen".