91005000477 has 4 divisors (see below), whose sum is σ = 121340000640. Its totient is φ = 60670000316.

The previous prime is 91005000469. The next prime is 91005000479. The reversal of 91005000477 is 77400050019.

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 91005000477 - 2³ = 91005000469 is a prime.

It is a super-2 number, since 2×91005000477² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91005000479) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15167500077 + ... + 15167500082.

It is an arithmetic number, because the mean of its divisors is an integer number (30335000160).

Almost surely, 2^91005000477 is an apocalyptic number.

It is an amenable number.

91005000477 is a deficient number, since it is larger than the sum of its proper divisors (30335000163).

91005000477 is a wasteful number, since it uses less digits than its factorization.

91005000477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30335000162.

The product of its (nonzero) digits is 8820, while the sum is 33.

The spelling of 91005000477 in words is "ninety-one billion, five million, four hundred seventy-seven", and thus it is an aban number.