91221494 has 16 divisors (see below), whose sum is σ = 168409248. Its totient is φ = 36087552.

The previous prime is 91221491. The next prime is 91221509. The reversal of 91221494 is 49412219.

It is a self number, because there is not a number n which added to its sum of digits gives 91221494.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91221491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 250427 + ... + 250790.

It is an arithmetic number, because the mean of its divisors is an integer number (10525578).

Almost surely, 2^91221494 is an apocalyptic number.

91221494 is a deficient number, since it is larger than the sum of its proper divisors (77187754).

91221494 is a wasteful number, since it uses less digits than its factorization.

91221494 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 501239.

The product of its digits is 5184, while the sum is 32.

The square root of 91221494 is about 9550.9943984907. The cubic root of 91221494 is about 450.1587818276.

The spelling of 91221494 in words is "ninety-one million, two hundred twenty-one thousand, four hundred ninety-four".