100523891 has 4 divisors (see below), whose sum is σ = 108256512. Its totient is φ = 92791272.

The previous prime is 100523867. The next prime is 100523897. The reversal of 100523891 is 198325001.

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

It is a cyclic number.

It is not a de Polignac number, because 100523891 - 2¹⁰ = 100522867 is a prime.

It is not an unprimeable number, because it can be changed into a prime (100523897) 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, 3866291 + ... + 3866316.

It is an arithmetic number, because the mean of its divisors is an integer number (27064128).

Almost surely, 2^100523891 is an apocalyptic number.

100523891 is a deficient number, since it is larger than the sum of its proper divisors (7732621).

100523891 is an equidigital number, since it uses as much as digits as its factorization.

100523891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7732620.

The product of its (nonzero) digits is 2160, while the sum is 29.

The square root of 100523891 is about 10026.1603318519. The cubic root of 100523891 is about 464.9680341845.

Adding to 100523891 its reverse (198325001), we get a palindrome (298848892).

The spelling of 100523891 in words is "one hundred million, five hundred twenty-three thousand, eight hundred ninety-one".