1531863313 has 2 divisors, whose sum is σ = 1531863314. Its totient is φ = 1531863312.

The previous prime is 1531863301. The next prime is 1531863323. The reversal of 1531863313 is 3133681351.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840594049 + 691269264 = 28993^2 + 26292^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1531863313 is a prime.

It is not a weakly prime, because it can be changed into another prime (1531863323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765931656 + 765931657.

It is an arithmetic number, because the mean of its divisors is an integer number (765931657).

Almost surely, 2^1531863313 is an apocalyptic number.

It is an amenable number.

1531863313 is a deficient number, since it is larger than the sum of its proper divisors (1).

1531863313 is an equidigital number, since it uses as much as digits as its factorization.

1531863313 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19440, while the sum is 34.

The square root of 1531863313 is about 39139.0254477548. The cubic root of 1531863313 is about 1152.7629376719.

The spelling of 1531863313 in words is "one billion, five hundred thirty-one million, eight hundred sixty-three thousand, three hundred thirteen".