31331413249 has 2 divisors, whose sum is σ = 31331413250. Its totient is φ = 31331413248.

The previous prime is 31331413163. The next prime is 31331413259. The reversal of 31331413249 is 94231413313.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19156497649 + 12174915600 = 138407^2 + 110340^2 .

It is a cyclic number.

It is not a de Polignac number, because 31331413249 - 2²¹ = 31329316097 is a prime.

It is a super-2 number, since 2×31331413249² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (31331413259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15665706624 + 15665706625.

It is an arithmetic number, because the mean of its divisors is an integer number (15665706625).

Almost surely, 2^31331413249 is an apocalyptic number.

It is an amenable number.

31331413249 is a deficient number, since it is larger than the sum of its proper divisors (1).

31331413249 is an equidigital number, since it uses as much as digits as its factorization.

31331413249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 34.

The spelling of 31331413249 in words is "thirty-one billion, three hundred thirty-one million, four hundred thirteen thousand, two hundred forty-nine".