218920901 has 4 divisors (see below), whose sum is σ = 218961600. Its totient is φ = 218880204.

The previous prime is 218920879. The next prime is 218920909. The reversal of 218920901 is 109029812.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 218920901 - 2⁶ = 218920837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218920909) 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, 10781 + ... + 23538.

It is an arithmetic number, because the mean of its divisors is an integer number (54740400).

Almost surely, 2^218920901 is an apocalyptic number.

It is an amenable number.

218920901 is a deficient number, since it is larger than the sum of its proper divisors (40699).

218920901 is an equidigital number, since it uses as much as digits as its factorization.

218920901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40698.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 218920901 is about 14795.9758380446. The cubic root of 218920901 is about 602.6924378547.

The spelling of 218920901 in words is "two hundred eighteen million, nine hundred twenty thousand, nine hundred one".