15541122991 has 2 divisors, whose sum is σ = 15541122992. Its totient is φ = 15541122990.

The previous prime is 15541122959. The next prime is 15541123027. The reversal of 15541122991 is 19922114551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 15541122991 - 2⁵ = 15541122959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15541122901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7770561495 + 7770561496.

It is an arithmetic number, because the mean of its divisors is an integer number (7770561496).

Almost surely, 2^15541122991 is an apocalyptic number.

15541122991 is a deficient number, since it is larger than the sum of its proper divisors (1).

15541122991 is an equidigital number, since it uses as much as digits as its factorization.

15541122991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400, while the sum is 40.

The spelling of 15541122991 in words is "fifteen billion, five hundred forty-one million, one hundred twenty-two thousand, nine hundred ninety-one".