91398001 has 4 divisors (see below), whose sum is σ = 96774372. Its totient is φ = 86021632.

The previous prime is 91397993. The next prime is 91398007. The reversal of 91398001 is 10089319.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 74390625 + 17007376 = 8625^2 + 4124^2 .

It is not a de Polignac number, because 91398001 - 2³ = 91397993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91398007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2688160 + ... + 2688193.

It is an arithmetic number, because the mean of its divisors is an integer number (24193593).

Almost surely, 2^91398001 is an apocalyptic number.

It is an amenable number.

91398001 is a deficient number, since it is larger than the sum of its proper divisors (5376371).

91398001 is a wasteful number, since it uses less digits than its factorization.

91398001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5376370.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 91398001 is about 9560.2301750533. The cubic root of 91398001 is about 450.4489363380.

The spelling of 91398001 in words is "ninety-one million, three hundred ninety-eight thousand, one".