100440591 has 8 divisors (see below), whose sum is σ = 134898864. Its totient is φ = 66471360.

The previous prime is 100440577. The next prime is 100440629. The reversal of 100440591 is 195044001.

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

It is not a de Polignac number, because 100440591 - 2¹⁵ = 100407823 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100440511) 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, 121780 + ... + 122601.

It is an arithmetic number, because the mean of its divisors is an integer number (16862358).

Almost surely, 2^100440591 is an apocalyptic number.

100440591 is a deficient number, since it is larger than the sum of its proper divisors (34458273).

100440591 is a wasteful number, since it uses less digits than its factorization.

100440591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 244521.

The product of its (nonzero) digits is 720, while the sum is 24.

The square root of 100440591 is about 10022.0053382544. The cubic root of 100440591 is about 464.8395654185.

Adding to 100440591 its reverse (195044001), we get a palindrome (295484592).

The spelling of 100440591 in words is "one hundred million, four hundred forty thousand, five hundred ninety-one".