31313021401 has 2 divisors, whose sum is σ = 31313021402. Its totient is φ = 31313021400.

The previous prime is 31313021381. The next prime is 31313021417. The reversal of 31313021401 is 10412031313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30878924176 + 434097225 = 175724^2 + 20835^2 .

It is a cyclic number.

It is not a de Polignac number, because 31313021401 - 2¹⁵ = 31312988633 is a prime.

It is not a weakly prime, because it can be changed into another prime (31313024401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15656510700 + 15656510701.

It is an arithmetic number, because the mean of its divisors is an integer number (15656510701).

Almost surely, 2^31313021401 is an apocalyptic number.

It is an amenable number.

31313021401 is a deficient number, since it is larger than the sum of its proper divisors (1).

31313021401 is an equidigital number, since it uses as much as digits as its factorization.

31313021401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31313021401 its reverse (10412031313), we get a palindrome (41725052714).

The spelling of 31313021401 in words is "thirty-one billion, three hundred thirteen million, twenty-one thousand, four hundred one".