31313220401 has 2 divisors, whose sum is σ = 31313220402. Its totient is φ = 31313220400.

The previous prime is 31313220331. The next prime is 31313220443. The reversal of 31313220401 is 10402231313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30102250000 + 1210970401 = 173500^2 + 34799^2 .

It is a cyclic number.

It is not a de Polignac number, because 31313220401 - 2²² = 31309026097 is a prime.

It is not a weakly prime, because it can be changed into another prime (31313240401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656610200 + 15656610201.

It is an arithmetic number, because the mean of its divisors is an integer number (15656610201).

Almost surely, 2^31313220401 is an apocalyptic number.

It is an amenable number.

31313220401 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313220401 is an equidigital number, since it uses as much as digits as its factorization.

31313220401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 31313220401 its reverse (10402231313), we get a palindrome (41715451714).

The spelling of 31313220401 in words is "thirty-one billion, three hundred thirteen million, two hundred twenty thousand, four hundred one".