1318877531 has 2 divisors, whose sum is σ = 1318877532. Its totient is φ = 1318877530.

The previous prime is 1318877509. The next prime is 1318877687. The reversal of 1318877531 is 1357788131.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1318877531 is a prime.

It is a super-2 number, since 2×1318877531² = 3478875883553311922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1318871531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 659438765 + 659438766.

It is an arithmetic number, because the mean of its divisors is an integer number (659438766).

Almost surely, 2^1318877531 is an apocalyptic number.

1318877531 is a deficient number, since it is larger than the sum of its proper divisors (1).

1318877531 is an equidigital number, since it uses as much as digits as its factorization.

1318877531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141120, while the sum is 44.

The square root of 1318877531 is about 36316.3534926072. The cubic root of 1318877531 is about 1096.6502866871.

The spelling of 1318877531 in words is "one billion, three hundred eighteen million, eight hundred seventy-seven thousand, five hundred thirty-one".