91337551 has 2 divisors, whose sum is σ = 91337552. Its totient is φ = 91337550.

The previous prime is 91337483. The next prime is 91337567. The reversal of 91337551 is 15573319.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 91337551 - 2²¹ = 89240399 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91337581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45668775 + 45668776.

It is an arithmetic number, because the mean of its divisors is an integer number (45668776).

Almost surely, 2^91337551 is an apocalyptic number.

91337551 is a deficient number, since it is larger than the sum of its proper divisors (1).

91337551 is an equidigital number, since it uses as much as digits as its factorization.

91337551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14175, while the sum is 34.

The square root of 91337551 is about 9557.0681173674. The cubic root of 91337551 is about 450.3496065085.

The spelling of 91337551 in words is "ninety-one million, three hundred thirty-seven thousand, five hundred fifty-one".