91645955 has 4 divisors (see below), whose sum is σ = 109975152. Its totient is φ = 73316760.

The previous prime is 91645937. The next prime is 91645979. The reversal of 91645955 is 55954619.

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

It is not a de Polignac number, because 91645955 - 2¹⁸ = 91383811 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9164591 + ... + 9164600.

It is an arithmetic number, because the mean of its divisors is an integer number (27493788).

Almost surely, 2^91645955 is an apocalyptic number.

91645955 is a deficient number, since it is larger than the sum of its proper divisors (18329197).

91645955 is a wasteful number, since it uses less digits than its factorization.

91645955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18329196.

The product of its digits is 243000, while the sum is 44.

The square root of 91645955 is about 9573.1893849438. The cubic root of 91645955 is about 450.8559101023.

The spelling of 91645955 in words is "ninety-one million, six hundred forty-five thousand, nine hundred fifty-five".