1312266889 has 2 divisors, whose sum is σ = 1312266890. Its totient is φ = 1312266888.

The previous prime is 1312266887. The next prime is 1312266919. The reversal of 1312266889 is 9886622131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 777963664 + 534303225 = 27892^2 + 23115^2 .

It is an emirp because it is prime and its reverse (9886622131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1312266889 - 2¹ = 1312266887 is a prime.

Together with 1312266887, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1312266881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656133444 + 656133445.

It is an arithmetic number, because the mean of its divisors is an integer number (656133445).

Almost surely, 2^1312266889 is an apocalyptic number.

It is an amenable number.

1312266889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312266889 is an equidigital number, since it uses as much as digits as its factorization.

1312266889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 1312266889 is about 36225.2244851567. The cubic root of 1312266889 is about 1094.8149611921.

The spelling of 1312266889 in words is "one billion, three hundred twelve million, two hundred sixty-six thousand, eight hundred eighty-nine".