218901145 has 8 divisors (see below), whose sum is σ = 262760904. Its totient is φ = 175067904.

The previous prime is 218901047. The next prime is 218901149. The reversal of 218901145 is 541109812.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 64048009 + 154853136 = 8003^2 + 12444^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 218901145 - 2⁷ = 218901017 is a prime.

It is a super-2 number, since 2×218901145² = 95835422564622050, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (218901149) 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, 27787 + ... + 34783.

It is an arithmetic number, because the mean of its divisors is an integer number (32845113).

Almost surely, 2^218901145 is an apocalyptic number.

It is an amenable number.

218901145 is a deficient number, since it is larger than the sum of its proper divisors (43859759).

218901145 is an equidigital number, since it uses as much as digits as its factorization.

218901145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13259.

The product of its (nonzero) digits is 2880, while the sum is 31.

The square root of 218901145 is about 14795.3082090236. The cubic root of 218901145 is about 602.6743077904.

The spelling of 218901145 in words is "two hundred eighteen million, nine hundred one thousand, one hundred forty-five".