31980501 has 32 divisors (see below), whose sum is σ = 54841600. Its totient is φ = 18265824.

The previous prime is 31980493. The next prime is 31980503. The reversal of 31980501 is 10508913.

It is not a de Polignac number, because 31980501 - 2³ = 31980493 is a prime.

It is a super-2 number, since 2×31980501² = 2045504888422002, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31980503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14265 + ... + 16353.

It is an arithmetic number, because the mean of its divisors is an integer number (1713800).

Almost surely, 2^31980501 is an apocalyptic number.

It is an amenable number.

31980501 is a deficient number, since it is larger than the sum of its proper divisors (22861099).

31980501 is an frugal number, since it uses more digits than its factorization.

31980501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2117 (or 2099 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 31980501 is about 5655.1305024730. The cubic root of 31980501 is about 317.4157124307.

The spelling of 31980501 in words is "thirty-one million, nine hundred eighty thousand, five hundred one".