91186522961 has 8 divisors (see below), whose sum is σ = 92290914984. Its totient is φ = 90086083200.

The previous prime is 91186522951. The next prime is 91186522979. The reversal of 91186522961 is 16922568119.

It can be written as a sum of positive squares in 4 ways, for example, as 34432513600 + 56754009361 = 185560^2 + 238231^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91186522961 - 2¹⁸ = 91186260817 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (91186522951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 941630 + ... + 1033943.

It is an arithmetic number, because the mean of its divisors is an integer number (11536364373).

Almost surely, 2^91186522961 is an apocalyptic number.

It is an amenable number.

91186522961 is a deficient number, since it is larger than the sum of its proper divisors (1104392023).

91186522961 is a wasteful number, since it uses less digits than its factorization.

91186522961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976131.

The product of its digits is 466560, while the sum is 50.

The spelling of 91186522961 in words is "ninety-one billion, one hundred eighty-six million, five hundred twenty-two thousand, nine hundred sixty-one".