1312061889 has 4 divisors (see below), whose sum is σ = 1749415856. Its totient is φ = 874707924.

The previous prime is 1312061879. The next prime is 1312061897. The reversal of 1312061889 is 9881602131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9881602131 = 3 ⋅3293867377.

It is not a de Polignac number, because 1312061889 - 2⁵ = 1312061857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1312061879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 218676979 + ... + 218676984.

It is an arithmetic number, because the mean of its divisors is an integer number (437353964).

Almost surely, 2^1312061889 is an apocalyptic number.

It is an amenable number.

1312061889 is a deficient number, since it is larger than the sum of its proper divisors (437353967).

1312061889 is an equidigital number, since it uses as much as digits as its factorization.

1312061889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437353966.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1312061889 is about 36222.3948545648. The cubic root of 1312061889 is about 1094.7579482077.

The spelling of 1312061889 in words is "one billion, three hundred twelve million, sixty-one thousand, eight hundred eighty-nine".