1131937861 has 2 divisors, whose sum is σ = 1131937862. Its totient is φ = 1131937860.

The previous prime is 1131937759. The next prime is 1131937871. The reversal of 1131937861 is 1687391311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 955180836 + 176757025 = 30906^2 + 13295^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131937861 - 2¹¹ = 1131935813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1131937871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565968930 + 565968931.

It is an arithmetic number, because the mean of its divisors is an integer number (565968931).

Almost surely, 2^1131937861 is an apocalyptic number.

It is an amenable number.

1131937861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131937861 is an equidigital number, since it uses as much as digits as its factorization.

1131937861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 40.

The square root of 1131937861 is about 33644.2842248130. The cubic root of 1131937861 is about 1042.1755067417.

The spelling of 1131937861 in words is "one billion, one hundred thirty-one million, nine hundred thirty-seven thousand, eight hundred sixty-one".