1331145915 has 16 divisors (see below), whose sum is σ = 2323454976. Its totient is φ = 645404000.

The previous prime is 1331145913. The next prime is 1331145923. The reversal of 1331145915 is 5195411331.

It is not a de Polignac number, because 1331145915 - 2¹ = 1331145913 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1331145913) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4033611 + ... + 4033940.

It is an arithmetic number, because the mean of its divisors is an integer number (145215936).

Almost surely, 2^1331145915 is an apocalyptic number.

1331145915 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1331145915 is a deficient number, since it is larger than the sum of its proper divisors (992309061).

1331145915 is a wasteful number, since it uses less digits than its factorization.

1331145915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8067570.

The product of its digits is 8100, while the sum is 33.

The square root of 1331145915 is about 36484.8724130975. The cubic root of 1331145915 is about 1100.0401955009.

The spelling of 1331145915 in words is "one billion, three hundred thirty-one million, one hundred forty-five thousand, nine hundred fifteen".