215118401 has 4 divisors (see below), whose sum is σ = 215550000. Its totient is φ = 214686804.

The previous prime is 215118383. The next prime is 215118451. The reversal of 215118401 is 104811512.

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 215118401 - 2²² = 210924097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (215118451) 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, 215051 + ... + 216048.

It is an arithmetic number, because the mean of its divisors is an integer number (53887500).

Almost surely, 2^215118401 is an apocalyptic number.

It is an amenable number.

215118401 is a deficient number, since it is larger than the sum of its proper divisors (431599).

215118401 is an equidigital number, since it uses as much as digits as its factorization.

215118401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431598.

The product of its (nonzero) digits is 320, while the sum is 23.

The square root of 215118401 is about 14666.9151835006. The cubic root of 215118401 is about 599.1825915410.

Adding to 215118401 its reverse (104811512), we get a palindrome (319929913).

The spelling of 215118401 in words is "two hundred fifteen million, one hundred eighteen thousand, four hundred one".