31901641 has 2 divisors, whose sum is σ = 31901642. Its totient is φ = 31901640.

The previous prime is 31901633. The next prime is 31901647. The reversal of 31901641 is 14610913.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28676025 + 3225616 = 5355^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 31901641 - 2³ = 31901633 is a prime.

It is not a weakly prime, because it can be changed into another prime (31901647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15950820 + 15950821.

It is an arithmetic number, because the mean of its divisors is an integer number (15950821).

Almost surely, 2^31901641 is an apocalyptic number.

It is an amenable number.

31901641 is a deficient number, since it is larger than the sum of its proper divisors (1).

31901641 is an equidigital number, since it uses as much as digits as its factorization.

31901641 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 25.

The square root of 31901641 is about 5648.1537691532. The cubic root of 31901641 is about 317.1545949235.

The spelling of 31901641 in words is "thirty-one million, nine hundred one thousand, six hundred forty-one".