1131643791 has 20 divisors (see below), whose sum is σ = 1697245704. Its totient is φ = 751410000.

The previous prime is 1131643759. The next prime is 1131643813. The reversal of 1131643791 is 1973461311.

1131643791 is a `hidden beast` number, since 1 + 1 + 3 + 1 + 643 + 7 + 9 + 1 = 666.

It is not a de Polignac number, because 1131643791 - 2⁵ = 1131643759 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131643291) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7500 + ... + 48161.

Almost surely, 2^1131643791 is an apocalyptic number.

1131643791 is a deficient number, since it is larger than the sum of its proper divisors (565601913).

1131643791 is an equidigital number, since it uses as much as digits as its factorization.

1131643791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55924 (or 55915 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 1131643791 is about 33639.9136592233. The cubic root of 1131643791 is about 1042.0852488145.

The spelling of 1131643791 in words is "one billion, one hundred thirty-one million, six hundred forty-three thousand, seven hundred ninety-one".