91230607977 has 4 divisors (see below), whose sum is σ = 121640810640. Its totient is φ = 60820405316.

The previous prime is 91230607931. The next prime is 91230608041. The reversal of 91230607977 is 77970603219.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91230607977 - 2¹⁴ = 91230591593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91230607927) 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 in 3 ways as a sum of consecutive naturals, for example, 15205101327 + ... + 15205101332.

It is an arithmetic number, because the mean of its divisors is an integer number (30410202660).

Almost surely, 2^91230607977 is an apocalyptic number.

It is an amenable number.

91230607977 is a deficient number, since it is larger than the sum of its proper divisors (30410202663).

91230607977 is a wasteful number, since it uses less digits than its factorization.

91230607977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30410202662.

The product of its (nonzero) digits is 1000188, while the sum is 51.

The spelling of 91230607977 in words is "ninety-one billion, two hundred thirty million, six hundred seven thousand, nine hundred seventy-seven".