1312191520 has 24 divisors (see below), whose sum is σ = 3100052844. Its totient is φ = 524876544.

The previous prime is 1312191497. The next prime is 1312191521. The reversal of 1312191520 is 251912131.

It can be written as a sum of positive squares in 2 ways, for example, as 1213546896 + 98644624 = 34836^2 + 9932^2 .

It is not an unprimeable number, because it can be changed into a prime (1312191521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4100439 + ... + 4100758.

Almost surely, 2^1312191520 is an apocalyptic number.

1312191520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312191520 is an abundant number, since it is smaller than the sum of its proper divisors (1787861324).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1312191520 is an equidigital number, since it uses as much as digits as its factorization.

1312191520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8201212 (or 8201204 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 25.

The square root of 1312191520 is about 36224.1841868109. The cubic root of 1312191520 is about 1094.7940008500.

The spelling of 1312191520 in words is "one billion, three hundred twelve million, one hundred ninety-one thousand, five hundred twenty".