1312615889 has 8 divisors (see below), whose sum is σ = 1431480960. Its totient is φ = 1196307216.

The previous prime is 1312615879. The next prime is 1312615891. The reversal of 1312615889 is 9885162131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1312615889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1312615879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638027 + ... + 640080.

It is an arithmetic number, because the mean of its divisors is an integer number (178935120).

Almost surely, 2^1312615889 is an apocalyptic number.

It is an amenable number.

1312615889 is a deficient number, since it is larger than the sum of its proper divisors (118865071).

1312615889 is a wasteful number, since it uses less digits than its factorization.

1312615889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278199.

The product of its digits is 103680, while the sum is 44.

The square root of 1312615889 is about 36230.0412503215. The cubic root of 1312615889 is about 1094.9120086644.

The spelling of 1312615889 in words is "one billion, three hundred twelve million, six hundred fifteen thousand, eight hundred eighty-nine".