91582204261 has 2 divisors, whose sum is σ = 91582204262. Its totient is φ = 91582204260.

The previous prime is 91582204253. The next prime is 91582204277. The reversal of 91582204261 is 16240228519.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69561425025 + 22020779236 = 263745^2 + 148394^2 .

It is a cyclic number.

It is not a de Polignac number, because 91582204261 - 2³ = 91582204253 is a prime.

It is a super-2 number, since 2×91582204261² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91582204561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45791102130 + 45791102131.

It is an arithmetic number, because the mean of its divisors is an integer number (45791102131).

Almost surely, 2^91582204261 is an apocalyptic number.

It is an amenable number.

91582204261 is a deficient number, since it is larger than the sum of its proper divisors (1).

91582204261 is an equidigital number, since it uses as much as digits as its factorization.

91582204261 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 40.

The spelling of 91582204261 in words is "ninety-one billion, five hundred eighty-two million, two hundred four thousand, two hundred sixty-one".