91615001 has 2 divisors, whose sum is σ = 91615002. Its totient is φ = 91615000.

The previous prime is 91614967. The next prime is 91615009. The reversal of 91615001 is 10051619.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87909376 + 3705625 = 9376^2 + 1925^2 .

It is an emirp because it is prime and its reverse (10051619) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 91615001 - 2⁶ = 91614937 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (91615009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45807500 + 45807501.

It is an arithmetic number, because the mean of its divisors is an integer number (45807501).

Almost surely, 2^91615001 is an apocalyptic number.

It is an amenable number.

91615001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91615001 is an equidigital number, since it uses as much as digits as its factorization.

91615001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 270, while the sum is 23.

The square root of 91615001 is about 9571.5725458255. The cubic root of 91615001 is about 450.8051445762.

The spelling of 91615001 in words is "ninety-one million, six hundred fifteen thousand, one".