91808051 has 2 divisors, whose sum is σ = 91808052. Its totient is φ = 91808050.

The previous prime is 91808047. The next prime is 91808069. The reversal of 91808051 is 15080819.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 91808051 - 2² = 91808047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91807999 and 91808017.

It is not a weakly prime, because it can be changed into another prime (91808021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45904025 + 45904026.

It is an arithmetic number, because the mean of its divisors is an integer number (45904026).

Almost surely, 2^91808051 is an apocalyptic number.

91808051 is a deficient number, since it is larger than the sum of its proper divisors (1).

91808051 is an equidigital number, since it uses as much as digits as its factorization.

91808051 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 32.

The square root of 91808051 is about 9581.6517887053. The cubic root of 91808051 is about 451.1215661069.

The spelling of 91808051 in words is "ninety-one million, eight hundred eight thousand, fifty-one".