1365256513 has 2 divisors, whose sum is σ = 1365256514. Its totient is φ = 1365256512.

The previous prime is 1365256511. The next prime is 1365256589. The reversal of 1365256513 is 3156525631.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 702091009 + 663165504 = 26497^2 + 25752^2 .

It is a cyclic number.

It is not a de Polignac number, because 1365256513 - 2¹ = 1365256511 is a prime.

Together with 1365256511, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1365256511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 682628256 + 682628257.

It is an arithmetic number, because the mean of its divisors is an integer number (682628257).

Almost surely, 2^1365256513 is an apocalyptic number.

It is an amenable number.

1365256513 is a deficient number, since it is larger than the sum of its proper divisors (1).

1365256513 is an equidigital number, since it uses as much as digits as its factorization.

1365256513 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 37.

The square root of 1365256513 is about 36949.3777078857. The cubic root of 1365256513 is about 1109.3572322254.

The spelling of 1365256513 in words is "one billion, three hundred sixty-five million, two hundred fifty-six thousand, five hundred thirteen".