91888001 has 2 divisors, whose sum is σ = 91888002. Its totient is φ = 91888000.

The previous prime is 91887997. The next prime is 91888063. The reversal of 91888001 is 10088819.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 77862976 + 14025025 = 8824^2 + 3745^2 .

It is a cyclic number.

It is not a de Polignac number, because 91888001 - 2² = 91887997 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91888081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45944000 + 45944001.

It is an arithmetic number, because the mean of its divisors is an integer number (45944001).

Almost surely, 2^91888001 is an apocalyptic number.

It is an amenable number.

91888001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91888001 is an equidigital number, since it uses as much as digits as its factorization.

91888001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 91888001 is about 9585.8229172043. The cubic root of 91888001 is about 451.2524794793.

The spelling of 91888001 in words is "ninety-one million, eight hundred eighty-eight thousand, one".