91189476951 has 16 divisors (see below), whose sum is σ = 123172672896. Its totient is φ = 60001083296.

The previous prime is 91189476949. The next prime is 91189476991. The reversal of 91189476951 is 15967498119.

It is a cyclic number.

It is not a de Polignac number, because 91189476951 - 2¹ = 91189476949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91189476991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 71476 + ... + 432998.

It is an arithmetic number, because the mean of its divisors is an integer number (7698292056).

Almost surely, 2^91189476951 is an apocalyptic number.

91189476951 is a deficient number, since it is larger than the sum of its proper divisors (31983195945).

91189476951 is a wasteful number, since it uses less digits than its factorization.

91189476951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 362622.

The product of its digits is 4898880, while the sum is 60.

The spelling of 91189476951 in words is "ninety-one billion, one hundred eighty-nine million, four hundred seventy-six thousand, nine hundred fifty-one".