91376591 has 4 divisors (see below), whose sum is σ = 93501672. Its totient is φ = 89251512.

The previous prime is 91376563. The next prime is 91376599. The reversal of 91376591 is 19567319.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19567319 = 23 ⋅850753.

It is a cyclic number.

It is not a de Polignac number, because 91376591 - 2¹⁴ = 91360207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91376599) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1062476 + ... + 1062561.

It is an arithmetic number, because the mean of its divisors is an integer number (23375418).

Almost surely, 2^91376591 is an apocalyptic number.

91376591 is a deficient number, since it is larger than the sum of its proper divisors (2125081).

91376591 is a wasteful number, since it uses less digits than its factorization.

91376591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2125080.

The product of its digits is 51030, while the sum is 41.

The square root of 91376591 is about 9559.1103665561. The cubic root of 91376591 is about 450.4137610068.

The spelling of 91376591 in words is "ninety-one million, three hundred seventy-six thousand, five hundred ninety-one".