91088977 has 8 divisors (see below), whose sum is σ = 105113216. Its totient is φ = 77317632.

The previous prime is 91088909. The next prime is 91089001. The reversal of 91088977 is 77988019.

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

It is a de Polignac number, because none of the positive numbers 2^k-91088977 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91088977.

It is not an unprimeable number, because it can be changed into a prime (91088477) 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, 62448 + ... + 63889.

It is an arithmetic number, because the mean of its divisors is an integer number (13139152).

Almost surely, 2^91088977 is an apocalyptic number.

It is an amenable number.

91088977 is a deficient number, since it is larger than the sum of its proper divisors (14024239).

91088977 is a wasteful number, since it uses less digits than its factorization.

91088977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126447.

The product of its (nonzero) digits is 254016, while the sum is 49.

The square root of 91088977 is about 9544.0545367260. The cubic root of 91088977 is about 449.9406950653.

The spelling of 91088977 in words is "ninety-one million, eighty-eight thousand, nine hundred seventy-seven".