91866622 has 4 divisors (see below), whose sum is σ = 137799936. Its totient is φ = 45933310.

The previous prime is 91866613. The next prime is 91866647. The reversal of 91866622 is 22666819.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22666819 = 7 ⋅3238117.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22966654 + ... + 22966657.

It is an arithmetic number, because the mean of its divisors is an integer number (34449984).

Almost surely, 2^91866622 is an apocalyptic number.

91866622 is a deficient number, since it is larger than the sum of its proper divisors (45933314).

91866622 is a wasteful number, since it uses less digits than its factorization.

91866622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45933313.

The product of its digits is 62208, while the sum is 40.

The square root of 91866622 is about 9584.7077159400. The cubic root of 91866622 is about 451.2174800781.

The spelling of 91866622 in words is "ninety-one million, eight hundred sixty-six thousand, six hundred twenty-two".