31565241013 has 2 divisors, whose sum is σ = 31565241014. Its totient is φ = 31565241012.

The previous prime is 31565240983. The next prime is 31565241041. The reversal of 31565241013 is 31014256513.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26142685969 + 5422555044 = 161687^2 + 73638^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31565241013 is a prime.

It is a super-3 number, since 3×31565241013³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (31565241913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15782620506 + 15782620507.

It is an arithmetic number, because the mean of its divisors is an integer number (15782620507).

Almost surely, 2^31565241013 is an apocalyptic number.

It is an amenable number.

31565241013 is a deficient number, since it is larger than the sum of its proper divisors (1).

31565241013 is an equidigital number, since it uses as much as digits as its factorization.

31565241013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10800, while the sum is 31.

Adding to 31565241013 its reverse (31014256513), we get a palindrome (62579497526).

The spelling of 31565241013 in words is "thirty-one billion, five hundred sixty-five million, two hundred forty-one thousand, thirteen".