1312569421 has 2 divisors, whose sum is σ = 1312569422. Its totient is φ = 1312569420.

The previous prime is 1312569383. The next prime is 1312569521. The reversal of 1312569421 is 1249652131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1179166921 + 133402500 = 34339^2 + 11550^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1312569421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1312569521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656284710 + 656284711.

It is an arithmetic number, because the mean of its divisors is an integer number (656284711).

Almost surely, 2^1312569421 is an apocalyptic number.

It is an amenable number.

1312569421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312569421 is an equidigital number, since it uses as much as digits as its factorization.

1312569421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 34.

The square root of 1312569421 is about 36229.3999536288. The cubic root of 1312569421 is about 1094.8990881617.

The spelling of 1312569421 in words is "one billion, three hundred twelve million, five hundred sixty-nine thousand, four hundred twenty-one".