91217151 has 32 divisors (see below), whose sum is σ = 141355200. Its totient is φ = 58060800.

The previous prime is 91217141. The next prime is 91217167. The reversal of 91217151 is 15171219.

It is not a de Polignac number, because 91217151 - 2¹⁵ = 91184383 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91217111) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 75351 + ... + 76551.

It is an arithmetic number, because the mean of its divisors is an integer number (4417350).

Almost surely, 2^91217151 is an apocalyptic number.

91217151 is a deficient number, since it is larger than the sum of its proper divisors (50138049).

91217151 is a wasteful number, since it uses less digits than its factorization.

91217151 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1336 (or 1330 counting only the distinct ones).

The product of its digits is 630, while the sum is 27.

The square root of 91217151 is about 9550.7670372594. The cubic root of 91217151 is about 450.1516377853.

The spelling of 91217151 in words is "ninety-one million, two hundred seventeen thousand, one hundred fifty-one".