1131550279 has 4 divisors (see below), whose sum is σ = 1137802120. Its totient is φ = 1125298440.

The previous prime is 1131550229. The next prime is 1131550283. The reversal of 1131550279 is 9720551311.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1131550279 - 2²⁷ = 997332551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131550229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3125649 + ... + 3126010.

It is an arithmetic number, because the mean of its divisors is an integer number (284450530).

Almost surely, 2^1131550279 is an apocalyptic number.

1131550279 is a deficient number, since it is larger than the sum of its proper divisors (6251841).

1131550279 is an equidigital number, since it uses as much as digits as its factorization.

1131550279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6251840.

The product of its (nonzero) digits is 9450, while the sum is 34.

The square root of 1131550279 is about 33638.5237339572. The cubic root of 1131550279 is about 1042.0565442107.

The spelling of 1131550279 in words is "one billion, one hundred thirty-one million, five hundred fifty thousand, two hundred seventy-nine".