31559401 has 2 divisors, whose sum is σ = 31559402. Its totient is φ = 31559400.

The previous prime is 31559383. The next prime is 31559413. The reversal of 31559401 is 10495513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29160000 + 2399401 = 5400^2 + 1549^2 .

It is a cyclic number.

It is not a de Polignac number, because 31559401 - 2¹⁵ = 31526633 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 31559401.

It is not a weakly prime, because it can be changed into another prime (31559471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15779700 + 15779701.

It is an arithmetic number, because the mean of its divisors is an integer number (15779701).

Almost surely, 2^31559401 is an apocalyptic number.

It is an amenable number.

31559401 is a deficient number, since it is larger than the sum of its proper divisors (1).

31559401 is an equidigital number, since it uses as much as digits as its factorization.

31559401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 31559401 is about 5617.7754494106. The cubic root of 31559401 is about 316.0163727296.

The spelling of 31559401 in words is "thirty-one million, five hundred fifty-nine thousand, four hundred one".