204523155 has 12 divisors (see below), whose sum is σ = 354506880. Its totient is φ = 109078992.

The previous prime is 204523147. The next prime is 204523169. The reversal of 204523155 is 551325402.

It is a happy number.

It is not a de Polignac number, because 204523155 - 2³ = 204523147 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2272435 + ... + 2272524.

It is an arithmetic number, because the mean of its divisors is an integer number (29542240).

Almost surely, 2^204523155 is an apocalyptic number.

204523155 is a deficient number, since it is larger than the sum of its proper divisors (149983725).

204523155 is a wasteful number, since it uses less digits than its factorization.

204523155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4544970 (or 4544967 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 204523155 is about 14301.1592187487. The cubic root of 204523155 is about 589.1793195717.

Adding to 204523155 its reverse (551325402), we get a palindrome (755848557).

It can be divided in two parts, 2045 and 23155, that added together give a triangular number (25200 = T₂₂₄).

The spelling of 204523155 in words is "two hundred four million, five hundred twenty-three thousand, one hundred fifty-five".