390100091 has 4 divisors (see below), whose sum is σ = 390154632. Its totient is φ = 390045552.

The previous prime is 390100031. The next prime is 390100093. The reversal of 390100091 is 190001093.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 190001093 = 41 ⋅4634173.

It is a cyclic number.

It is not a de Polignac number, because 390100091 - 2⁶ = 390100027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390100093) 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, 14570 + ... + 31503.

It is an arithmetic number, because the mean of its divisors is an integer number (97538658).

Almost surely, 2^390100091 is an apocalyptic number.

390100091 is a deficient number, since it is larger than the sum of its proper divisors (54541).

390100091 is an equidigital number, since it uses as much as digits as its factorization.

390100091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54540.

The product of its (nonzero) digits is 243, while the sum is 23.

The square root of 390100091 is about 19750.9516479586. The cubic root of 390100091 is about 730.6768545572.

The spelling of 390100091 in words is "three hundred ninety million, one hundred thousand, ninety-one".