91800001 has 8 divisors (see below), whose sum is σ = 97339680. Its totient is φ = 86331168.

The previous prime is 91799999. The next prime is 91800019. The reversal of 91800001 is 10000819.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91800001 - 2¹ = 91799999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91800031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15031 + ... + 20236.

It is an arithmetic number, because the mean of its divisors is an integer number (12167460).

Almost surely, 2^91800001 is an apocalyptic number.

It is an amenable number.

91800001 is a deficient number, since it is larger than the sum of its proper divisors (5539679).

91800001 is a wasteful number, since it uses less digits than its factorization.

91800001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35423.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 91800001 is about 9581.2317057881. The cubic root of 91800001 is about 451.1083804995.

The spelling of 91800001 in words is "ninety-one million, eight hundred thousand, one".