31990101 has 24 divisors (see below), whose sum is σ = 50497440. Its totient is φ = 17893920.

The previous prime is 31990097. The next prime is 31990183. The reversal of 31990101 is 10109913.

It is not a de Polignac number, because 31990101 - 2² = 31990097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31990501) 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 23 ways as a sum of consecutive naturals, for example, 1330 + ... + 8108.

It is an arithmetic number, because the mean of its divisors is an integer number (2104060).

Almost surely, 2^31990101 is an apocalyptic number.

It is an amenable number.

31990101 is a deficient number, since it is larger than the sum of its proper divisors (18507339).

31990101 is a wasteful number, since it uses less digits than its factorization.

31990101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6817 (or 6806 counting only the distinct ones).

The product of its (nonzero) digits is 243, while the sum is 24.

The square root of 31990101 is about 5655.9792255630. The cubic root of 31990101 is about 317.4474701778.

The spelling of 31990101 in words is "thirty-one million, nine hundred ninety thousand, one hundred one".