91427551 has 2 divisors, whose sum is σ = 91427552. Its totient is φ = 91427550.

The previous prime is 91427533. The next prime is 91427573. The reversal of 91427551 is 15572419.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91427551 - 2⁵ = 91427519 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91427591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45713775 + 45713776.

It is an arithmetic number, because the mean of its divisors is an integer number (45713776).

Almost surely, 2^91427551 is an apocalyptic number.

91427551 is a deficient number, since it is larger than the sum of its proper divisors (1).

91427551 is an equidigital number, since it uses as much as digits as its factorization.

91427551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12600, while the sum is 34.

The square root of 91427551 is about 9561.7755150390. The cubic root of 91427551 is about 450.4974761736.

The spelling of 91427551 in words is "ninety-one million, four hundred twenty-seven thousand, five hundred fifty-one".