91215244 has 6 divisors (see below), whose sum is σ = 159626684. Its totient is φ = 45607620.

The previous prime is 91215209. The next prime is 91215287. The reversal of 91215244 is 44251219.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11401902 + ... + 11401909.

Almost surely, 2^91215244 is an apocalyptic number.

It is an amenable number.

91215244 is a deficient number, since it is larger than the sum of its proper divisors (68411440).

91215244 is a wasteful number, since it uses less digits than its factorization.

91215244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22803815 (or 22803813 counting only the distinct ones).

The product of its digits is 2880, while the sum is 28.

The square root of 91215244 is about 9550.6672018242. The cubic root of 91215244 is about 450.1485007833.

It can be divided in two parts, 9121 and 5244, that added together give a triangular number (14365 = T₁₆₉).

The spelling of 91215244 in words is "ninety-one million, two hundred fifteen thousand, two hundred forty-four".