1131591972 has 48 divisors (see below), whose sum is σ = 3021806592. Its totient is φ = 322859040.

The previous prime is 1131591947. The next prime is 1131591983. The reversal of 1131591972 is 2791951311.

It is a self number, because there is not a number n which added to its sum of digits gives 1131591972.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53347 + ... + 71477.

It is an arithmetic number, because the mean of its divisors is an integer number (62954304).

Almost surely, 2^1131591972 is an apocalyptic number.

1131591972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1131591972 is an abundant number, since it is smaller than the sum of its proper divisors (1890214620).

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

1131591972 is a wasteful number, since it uses less digits than its factorization.

1131591972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18888 (or 18886 counting only the distinct ones).

The product of its digits is 17010, while the sum is 39.

The square root of 1131591972 is about 33639.1434492616. The cubic root of 1131591972 is about 1042.0693425608.

The spelling of 1131591972 in words is "one billion, one hundred thirty-one million, five hundred ninety-one thousand, nine hundred seventy-two".