91380001 has 2 divisors, whose sum is σ = 91380002. Its totient is φ = 91380000.

The previous prime is 91379993. The next prime is 91380017. The reversal of 91380001 is 10008319.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82083600 + 9296401 = 9060^2 + 3049^2 .

It is a cyclic number.

It is not a de Polignac number, because 91380001 - 2³ = 91379993 is a prime.

It is not a weakly prime, because it can be changed into another prime (91380301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45690000 + 45690001.

It is an arithmetic number, because the mean of its divisors is an integer number (45690001).

Almost surely, 2^91380001 is an apocalyptic number.

It is an amenable number.

91380001 is a deficient number, since it is larger than the sum of its proper divisors (1).

91380001 is an equidigital number, since it uses as much as digits as its factorization.

91380001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The square root of 91380001 is about 9559.2887287706. The cubic root of 91380001 is about 450.4193637978.

The spelling of 91380001 in words is "ninety-one million, three hundred eighty thousand, one".