100399291 has 4 divisors (see below), whose sum is σ = 100668832. Its totient is φ = 100129752.

The previous prime is 100399279. The next prime is 100399307. The reversal of 100399291 is 192993001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 192993001 = 8011 ⋅24091.

It is a cyclic number.

It is not a de Polignac number, because 100399291 - 2⁵ = 100399259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100399261) 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, 134211 + ... + 134956.

It is an arithmetic number, because the mean of its divisors is an integer number (25167208).

Almost surely, 2^100399291 is an apocalyptic number.

100399291 is a deficient number, since it is larger than the sum of its proper divisors (269541).

100399291 is an equidigital number, since it uses as much as digits as its factorization.

100399291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269540.

The product of its (nonzero) digits is 4374, while the sum is 34.

The square root of 100399291 is about 10019.9446605258. The cubic root of 100399291 is about 464.7758444807.

The spelling of 100399291 in words is "one hundred million, three hundred ninety-nine thousand, two hundred ninety-one".