10991881951 has 2 divisors, whose sum is σ = 10991881952. Its totient is φ = 10991881950.

The previous prime is 10991881937. The next prime is 10991881973. The reversal of 10991881951 is 15918819901.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10991881951 - 2²⁵ = 10958327519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10991881151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495940975 + 5495940976.

It is an arithmetic number, because the mean of its divisors is an integer number (5495940976).

Almost surely, 2^10991881951 is an apocalyptic number.

10991881951 is a deficient number, since it is larger than the sum of its proper divisors (1).

10991881951 is an equidigital number, since it uses as much as digits as its factorization.

10991881951 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 52.

The spelling of 10991881951 in words is "ten billion, nine hundred ninety-one million, eight hundred eighty-one thousand, nine hundred fifty-one".