1131957979 has 4 divisors (see below), whose sum is σ = 1140220584. Its totient is φ = 1123695376.

The previous prime is 1131957977. The next prime is 1131957989. The reversal of 1131957979 is 9797591311.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9797591311 = 61 ⋅160616251.

It is a cyclic number.

It is not a de Polignac number, because 1131957979 - 2¹ = 1131957977 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131957977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4131097 + ... + 4131370.

It is an arithmetic number, because the mean of its divisors is an integer number (285055146).

Almost surely, 2^1131957979 is an apocalyptic number.

1131957979 is a deficient number, since it is larger than the sum of its proper divisors (8262605).

1131957979 is an equidigital number, since it uses as much as digits as its factorization.

1131957979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8262604.

The product of its digits is 535815, while the sum is 52.

The square root of 1131957979 is about 33644.5832044328. The cubic root of 1131957979 is about 1042.1816809212.

The spelling of 1131957979 in words is "one billion, one hundred thirty-one million, nine hundred fifty-seven thousand, nine hundred seventy-nine".