1131978971 has 4 divisors (see below), whose sum is σ = 1181195472. Its totient is φ = 1082762472.

The previous prime is 1131978943. The next prime is 1131979019. The reversal of 1131978971 is 1798791311.

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 1131978971 - 2¹⁸ = 1131716827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131978931) 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, 24608216 + ... + 24608261.

It is an arithmetic number, because the mean of its divisors is an integer number (295298868).

Almost surely, 2^1131978971 is an apocalyptic number.

1131978971 is a deficient number, since it is larger than the sum of its proper divisors (49216501).

1131978971 is an equidigital number, since it uses as much as digits as its factorization.

1131978971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49216500.

The product of its digits is 95256, while the sum is 47.

The square root of 1131978971 is about 33644.8951699957. The cubic root of 1131978971 is about 1042.1881232518.

The spelling of 1131978971 in words is "one billion, one hundred thirty-one million, nine hundred seventy-eight thousand, nine hundred seventy-one".