91327551 has 16 divisors (see below), whose sum is σ = 139494144. Its totient is φ = 52064064.

The previous prime is 91327543. The next prime is 91327559. The reversal of 91327551 is 15572319.

It is an interprime number because it is at equal distance from previous prime (91327543) and next prime (91327559).

It is not a de Polignac number, because 91327551 - 2³ = 91327543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91327559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4395 + ... + 14211.

It is an arithmetic number, because the mean of its divisors is an integer number (8718384).

Almost surely, 2^91327551 is an apocalyptic number.

91327551 is a deficient number, since it is larger than the sum of its proper divisors (48166593).

91327551 is a wasteful number, since it uses less digits than its factorization.

91327551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10270.

The product of its digits is 9450, while the sum is 33.

The square root of 91327551 is about 9556.5449300466. The cubic root of 91327551 is about 450.3331705506. Note that the first 3 decimals are identical.

The spelling of 91327551 in words is "ninety-one million, three hundred twenty-seven thousand, five hundred fifty-one".