31992001 has 2 divisors, whose sum is σ = 31992002. Its totient is φ = 31992000.

The previous prime is 31991989. The next prime is 31992061. The reversal of 31992001 is 10029913.

31992001 = 3999² + 4000².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16000000 + 15992001 = 4000^2 + 3999^2 .

It is an emirp because it is prime and its reverse (10029913) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 31992001 - 2²¹ = 29894849 is a prime.

It is not a weakly prime, because it can be changed into another prime (31992061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15996000 + 15996001.

It is an arithmetic number, because the mean of its divisors is an integer number (15996001).

Almost surely, 2^31992001 is an apocalyptic number.

31992001 is the 4000-th centered square number.

It is an amenable number.

31992001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31992001 is an equidigital number, since it uses as much as digits as its factorization.

31992001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 486, while the sum is 25.

The square root of 31992001 is about 5656.1471869109. The cubic root of 31992001 is about 317.4537548120.

The spelling of 31992001 in words is "thirty-one million, nine hundred ninety-two thousand, one".