31393001 has 2 divisors, whose sum is σ = 31393002. Its totient is φ = 31393000.

The previous prime is 31392989. The next prime is 31393027. The reversal of 31393001 is 10039313.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19669225 + 11723776 = 4435^2 + 3424^2 .

It is a cyclic number.

It is not a de Polignac number, because 31393001 - 2²² = 27198697 is a prime.

It is not a weakly prime, because it can be changed into another prime (31393031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15696500 + 15696501.

It is an arithmetic number, because the mean of its divisors is an integer number (15696501).

Almost surely, 2^31393001 is an apocalyptic number.

It is an amenable number.

31393001 is a deficient number, since it is larger than the sum of its proper divisors (1).

31393001 is an equidigital number, since it uses as much as digits as its factorization.

31393001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 243, while the sum is 20.

The square root of 31393001 is about 5602.9457430891. The cubic root of 31393001 is about 315.4599847281.

The spelling of 31393001 in words is "thirty-one million, three hundred ninety-three thousand, one".