91062041621 has 2 divisors, whose sum is σ = 91062041622. Its totient is φ = 91062041620.

The previous prime is 91062041599. The next prime is 91062041683. The reversal of 91062041621 is 12614026019.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66403620721 + 24658420900 = 257689^2 + 157030^2 .

It is a cyclic number.

It is not a de Polignac number, because 91062041621 - 2³⁴ = 73882172437 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91062061621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45531020810 + 45531020811.

It is an arithmetic number, because the mean of its divisors is an integer number (45531020811).

Almost surely, 2^91062041621 is an apocalyptic number.

It is an amenable number.

91062041621 is a deficient number, since it is larger than the sum of its proper divisors (1).

91062041621 is an equidigital number, since it uses as much as digits as its factorization.

91062041621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 32.

The spelling of 91062041621 in words is "ninety-one billion, sixty-two million, forty-one thousand, six hundred twenty-one".