91016551 has 2 divisors, whose sum is σ = 91016552. Its totient is φ = 91016550.

The previous prime is 91016539. The next prime is 91016567. The reversal of 91016551 is 15561019.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91016551 - 2⁹ = 91016039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91016531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45508275 + 45508276.

It is an arithmetic number, because the mean of its divisors is an integer number (45508276).

Almost surely, 2^91016551 is an apocalyptic number.

91016551 is a deficient number, since it is larger than the sum of its proper divisors (1).

91016551 is an equidigital number, since it uses as much as digits as its factorization.

91016551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1350, while the sum is 28.

The square root of 91016551 is about 9540.2594828443. The cubic root of 91016551 is about 449.8214122623.

The spelling of 91016551 in words is "ninety-one million, sixteen thousand, five hundred fifty-one".