31868961 has 32 divisors (see below), whose sum is σ = 46891008. Its totient is φ = 19187520.

The previous prime is 31868939. The next prime is 31868983. The reversal of 31868961 is 16986813.

It is an interprime number because it is at equal distance from previous prime (31868939) and next prime (31868983).

It is not a de Polignac number, because 31868961 - 2⁹ = 31868449 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (31868911) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 100375 + ... + 100691.

It is an arithmetic number, because the mean of its divisors is an integer number (1465344).

Almost surely, 2^31868961 is an apocalyptic number.

31868961 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

31868961 is a deficient number, since it is larger than the sum of its proper divisors (15022047).

31868961 is a wasteful number, since it uses less digits than its factorization.

31868961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421.

The product of its digits is 62208, while the sum is 42.

The square root of 31868961 is about 5645.2600471546. The cubic root of 31868961 is about 317.0462603361.

The spelling of 31868961 in words is "thirty-one million, eight hundred sixty-eight thousand, nine hundred sixty-one".