91191622 has 4 divisors (see below), whose sum is σ = 136787436. Its totient is φ = 45595810.

The previous prime is 91191599. The next prime is 91191629. The reversal of 91191622 is 22619119.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22619119 = 31 ⋅729649.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91191629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22797904 + ... + 22797907.

It is an arithmetic number, because the mean of its divisors is an integer number (34196859).

Almost surely, 2^91191622 is an apocalyptic number.

91191622 is a deficient number, since it is larger than the sum of its proper divisors (45595814).

91191622 is a wasteful number, since it uses less digits than its factorization.

91191622 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45595813.

The product of its digits is 1944, while the sum is 31.

The square root of 91191622 is about 9549.4304542208. The cubic root of 91191622 is about 450.1096391287.

The spelling of 91191622 in words is "ninety-one million, one hundred ninety-one thousand, six hundred twenty-two".