204513157 has 4 divisors (see below), whose sum is σ = 207393696. Its totient is φ = 201632620.

The previous prime is 204513149. The next prime is 204513193. The reversal of 204513157 is 751315402.

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 204513157 - 2³ = 204513149 is a prime.

It is a super-2 number, since 2×204513157² = 83651262772213298, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204513137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1440163 + ... + 1440304.

It is an arithmetic number, because the mean of its divisors is an integer number (51848424).

Almost surely, 2^204513157 is an apocalyptic number.

It is an amenable number.

204513157 is a deficient number, since it is larger than the sum of its proper divisors (2880539).

204513157 is an equidigital number, since it uses as much as digits as its factorization.

204513157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2880538.

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 204513157 is about 14300.8096623932. The cubic root of 204513157 is about 589.1697188482.

Adding to 204513157 its reverse (751315402), we get a palindrome (955828559).

The spelling of 204513157 in words is "two hundred four million, five hundred thirteen thousand, one hundred fifty-seven".