1131868691 has 2 divisors, whose sum is σ = 1131868692. Its totient is φ = 1131868690.

The previous prime is 1131868657. The next prime is 1131868697. The reversal of 1131868691 is 1968681311.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1131868691 - 2¹⁴ = 1131852307 is a prime.

It is a super-2 number, since 2×1131868691² = 2562253467332106962, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1131868697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 565934345 + 565934346.

It is an arithmetic number, because the mean of its divisors is an integer number (565934346).

Almost surely, 2^1131868691 is an apocalyptic number.

1131868691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1131868691 is an equidigital number, since it uses as much as digits as its factorization.

1131868691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 44.

The square root of 1131868691 is about 33643.2562484668. The cubic root of 1131868691 is about 1042.1542780298.

The spelling of 1131868691 in words is "one billion, one hundred thirty-one million, eight hundred sixty-eight thousand, six hundred ninety-one".