91012144121 has 2 divisors, whose sum is σ = 91012144122. Its totient is φ = 91012144120.

The previous prime is 91012144099. The next prime is 91012144141. The reversal of 91012144121 is 12144121019.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82277185600 + 8734958521 = 286840^2 + 93461^2 .

It is a cyclic number.

It is not a de Polignac number, because 91012144121 - 2³⁰ = 89938402297 is a prime.

It is not a weakly prime, because it can be changed into another prime (91012144141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45506072060 + 45506072061.

It is an arithmetic number, because the mean of its divisors is an integer number (45506072061).

Almost surely, 2^91012144121 is an apocalyptic number.

It is an amenable number.

91012144121 is a deficient number, since it is larger than the sum of its proper divisors (1).

91012144121 is an equidigital number, since it uses as much as digits as its factorization.

91012144121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 91012144121 in words is "ninety-one billion, twelve million, one hundred forty-four thousand, one hundred twenty-one".