100664891 has 4 divisors (see below), whose sum is σ = 100685352. Its totient is φ = 100644432.

The previous prime is 100664873. The next prime is 100664917. The reversal of 100664891 is 198466001.

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 100664891 - 2¹⁴ = 100648507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (100664801) 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, 2120 + ... + 14346.

It is an arithmetic number, because the mean of its divisors is an integer number (25171338).

Almost surely, 2^100664891 is an apocalyptic number.

100664891 is a deficient number, since it is larger than the sum of its proper divisors (20461).

100664891 is an equidigital number, since it uses as much as digits as its factorization.

100664891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20460.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 100664891 is about 10033.1894729443. The cubic root of 100664891 is about 465.1853286776.

The spelling of 100664891 in words is "one hundred million, six hundred sixty-four thousand, eight hundred ninety-one".