218526145 has 4 divisors (see below), whose sum is σ = 262231380. Its totient is φ = 174820912.

The previous prime is 218526137. The next prime is 218526149. The reversal of 218526145 is 541625812.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 114832656 + 103693489 = 10716^2 + 10183^2 .

It is a cyclic number.

It is not a de Polignac number, because 218526145 - 2³ = 218526137 is a prime.

It is a super-2 number, since 2×218526145² = 95507352097122050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 218526145.

It is not an unprimeable number, because it can be changed into a prime (218526149) 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, 21852610 + ... + 21852619.

It is an arithmetic number, because the mean of its divisors is an integer number (65557845).

Almost surely, 2^218526145 is an apocalyptic number.

It is an amenable number.

218526145 is a deficient number, since it is larger than the sum of its proper divisors (43705235).

218526145 is an equidigital number, since it uses as much as digits as its factorization.

218526145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43705234.

The product of its digits is 19200, while the sum is 34.

The square root of 218526145 is about 14782.6298404580. The cubic root of 218526145 is about 602.3299635528.

The spelling of 218526145 in words is "two hundred eighteen million, five hundred twenty-six thousand, one hundred forty-five".