1312216571 has 2 divisors, whose sum is σ = 1312216572. Its totient is φ = 1312216570.

The previous prime is 1312216523. The next prime is 1312216597. The reversal of 1312216571 is 1756122131.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312216571 - 2¹⁴ = 1312200187 is a prime.

It is not a weakly prime, because it can be changed into another prime (1312212571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656108285 + 656108286.

It is an arithmetic number, because the mean of its divisors is an integer number (656108286).

Almost surely, 2^1312216571 is an apocalyptic number.

1312216571 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312216571 is an equidigital number, since it uses as much as digits as its factorization.

1312216571 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 1312216571 is about 36224.5299624440. The cubic root of 1312216571 is about 1094.8009676964.

The spelling of 1312216571 in words is "one billion, three hundred twelve million, two hundred sixteen thousand, five hundred seventy-one".