91327951 has 32 divisors (see below), whose sum is σ = 113150016. Its totient is φ = 72576000.

The previous prime is 91327933. The next prime is 91327969. The reversal of 91327951 is 15972319.

It is an interprime number because it is at equal distance from previous prime (91327933) and next prime (91327969).

It is a 10-Lehmer number, since φ(91327951) divides (91327951-1)¹⁰.

It is a cyclic number.

It is not a de Polignac number, because 91327951 - 2⁷ = 91327823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91327951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91327991) by changing a digit.

It is a nontrivial repunit in base 450.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 216721 + ... + 217141.

It is an arithmetic number, because the mean of its divisors is an integer number (3535938).

Almost surely, 2^91327951 is an apocalyptic number.

91327951 is a deficient number, since it is larger than the sum of its proper divisors (21822065).

91327951 is a wasteful number, since it uses less digits than its factorization.

91327951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523.

The product of its digits is 17010, while the sum is 37.

The square root of 91327951 is about 9556.5658580894. The cubic root of 91327951 is about 450.3338280119. Note that the first 3 decimals are identical.

The spelling of 91327951 in words is "ninety-one million, three hundred twenty-seven thousand, nine hundred fifty-one".