11921800951 has 2 divisors, whose sum is σ = 11921800952. Its totient is φ = 11921800950.

The previous prime is 11921800939. The next prime is 11921800981. The reversal of 11921800951 is 15900812911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11921800951 - 2²⁵ = 11888246519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11921800951.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11921800901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5960900475 + 5960900476.

It is an arithmetic number, because the mean of its divisors is an integer number (5960900476).

Almost surely, 2^11921800951 is an apocalyptic number.

11921800951 is a deficient number, since it is larger than the sum of its proper divisors (1).

11921800951 is an equidigital number, since it uses as much as digits as its factorization.

11921800951 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 37.

The spelling of 11921800951 in words is "eleven billion, nine hundred twenty-one million, eight hundred thousand, nine hundred fifty-one".