11521554199 has 2 divisors, whose sum is σ = 11521554200. Its totient is φ = 11521554198.

The previous prime is 11521554139. The next prime is 11521554227. The reversal of 11521554199 is 99145512511.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11521554199 is a prime.

It is a super-2 number, since 2×11521554199² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11521554119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5760777099 + 5760777100.

It is an arithmetic number, because the mean of its divisors is an integer number (5760777100).

Almost surely, 2^11521554199 is an apocalyptic number.

11521554199 is a deficient number, since it is larger than the sum of its proper divisors (1).

11521554199 is an equidigital number, since it uses as much as digits as its factorization.

11521554199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81000, while the sum is 43.

The spelling of 11521554199 in words is "eleven billion, five hundred twenty-one million, five hundred fifty-four thousand, one hundred ninety-nine".