31912101 has 18 divisors (see below), whose sum is σ = 49916178. Its totient is φ = 19637280.

The previous prime is 31912091. The next prime is 31912103. The reversal of 31912101 is 10121913.

It can be written as a sum of positive squares in 3 ways, for example, as 900 + 31911201 = 30^2 + 5649^2 .

It is not a de Polignac number, because 31912101 - 2⁷ = 31911973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31912103) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 8970 + ... + 12011.

It is an arithmetic number, because the mean of its divisors is an integer number (2773121).

Almost surely, 2^31912101 is an apocalyptic number.

It is an amenable number.

31912101 is a deficient number, since it is larger than the sum of its proper divisors (18004077).

31912101 is a wasteful number, since it uses less digits than its factorization.

31912101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21013 (or 20997 counting only the distinct ones).

The product of its (nonzero) digits is 54, while the sum is 18.

The square root of 31912101 is about 5649.0796595552. The cubic root of 31912101 is about 317.1892543166.

The spelling of 31912101 in words is "thirty-one million, nine hundred twelve thousand, one hundred one".