203413561 has 4 divisors (see below), whose sum is σ = 219060772. Its totient is φ = 187766352.

The previous prime is 203413549. The next prime is 203413579. The reversal of 203413561 is 165314302.

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 95648400 + 107765161 = 9780^2 + 10381^2 .

It is a cyclic number.

It is not a de Polignac number, because 203413561 - 2⁷ = 203413433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (203413501) 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, 7823586 + ... + 7823611.

It is an arithmetic number, because the mean of its divisors is an integer number (54765193).

Almost surely, 2^203413561 is an apocalyptic number.

It is an amenable number.

203413561 is a deficient number, since it is larger than the sum of its proper divisors (15647211).

203413561 is a wasteful number, since it uses less digits than its factorization.

203413561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15647210.

The product of its (nonzero) digits is 2160, while the sum is 25.

The square root of 203413561 is about 14262.3126105131. The cubic root of 203413561 is about 588.1119006261. Note that the first 3 decimals are identical.

Adding to 203413561 its reverse (165314302), we get a palindrome (368727863).

The spelling of 203413561 in words is "two hundred three million, four hundred thirteen thousand, five hundred sixty-one".