2151268991 has 2 divisors, whose sum is σ = 2151268992. Its totient is φ = 2151268990.

The previous prime is 2151268957. The next prime is 2151268997. The reversal of 2151268991 is 1998621512.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2151268991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2151268997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075634495 + 1075634496.

It is an arithmetic number, because the mean of its divisors is an integer number (1075634496).

Almost surely, 2^2151268991 is an apocalyptic number.

2151268991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151268991 is an equidigital number, since it uses as much as digits as its factorization.

2151268991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 77760, while the sum is 44.

The square root of 2151268991 is about 46381.7743407904. The cubic root of 2151268991 is about 1290.9167593488.

The spelling of 2151268991 in words is "two billion, one hundred fifty-one million, two hundred sixty-eight thousand, nine hundred ninety-one".