91955047 has 4 divisors (see below), whose sum is σ = 91987056. Its totient is φ = 91923040.

The previous prime is 91955029. The next prime is 91955063. The reversal of 91955047 is 74055919.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91955047 - 2¹¹ = 91952999 is a prime.

It is a super-3 number, since 3×91955047³ (a number of 25 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91955947) 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, 11218 + ... + 17599.

It is an arithmetic number, because the mean of its divisors is an integer number (22996764).

Almost surely, 2^91955047 is an apocalyptic number.

91955047 is a deficient number, since it is larger than the sum of its proper divisors (32009).

91955047 is a wasteful number, since it uses less digits than its factorization.

91955047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32008.

The product of its (nonzero) digits is 56700, while the sum is 40.

The square root of 91955047 is about 9589.3194231916. The cubic root of 91955047 is about 451.3622047897.

The spelling of 91955047 in words is "ninety-one million, nine hundred fifty-five thousand, forty-seven".