1331891052 has 24 divisors (see below), whose sum is σ = 3142666800. Its totient is φ = 438974976.

The previous prime is 1331891039. The next prime is 1331891069. The reversal of 1331891052 is 2501981331.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622477 + ... + 624612.

It is an arithmetic number, because the mean of its divisors is an integer number (130944450).

Almost surely, 2^1331891052 is an apocalyptic number.

1331891052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1331891052 is an abundant number, since it is smaller than the sum of its proper divisors (1810775748).

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

1331891052 is a wasteful number, since it uses less digits than its factorization.

1331891052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1247185 (or 1247183 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 33.

The square root of 1331891052 is about 36495.0825728618. The cubic root of 1331891052 is about 1100.2454141136.

The spelling of 1331891052 in words is "one billion, three hundred thirty-one million, eight hundred ninety-one thousand, fifty-two".