100291993 has 4 divisors (see below), whose sum is σ = 106191540. Its totient is φ = 94392448.

The previous prime is 100291987. The next prime is 100292009. The reversal of 100291993 is 399192001.

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 53465344 + 46826649 = 7312^2 + 6843^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100291993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100291963) 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, 2949748 + ... + 2949781.

It is an arithmetic number, because the mean of its divisors is an integer number (26547885).

Almost surely, 2^100291993 is an apocalyptic number.

It is an amenable number.

100291993 is a deficient number, since it is larger than the sum of its proper divisors (5899547).

100291993 is an equidigital number, since it uses as much as digits as its factorization.

100291993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5899546.

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

The square root of 100291993 is about 10014.5890080422. The cubic root of 100291993 is about 464.6102148432.

The spelling of 100291993 in words is "one hundred million, two hundred ninety-one thousand, nine hundred ninety-three".