204013531 has 2 divisors, whose sum is σ = 204013532. Its totient is φ = 204013530.

The previous prime is 204013529. The next prime is 204013541. The reversal of 204013531 is 135310402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204013531 - 2¹ = 204013529 is a prime.

It is a super-2 number, since 2×204013531² = 83243041662175922, which contains 22 as substring.

Together with 204013529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 204013499 and 204013508.

It is not a weakly prime, because it can be changed into another prime (204013501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102006765 + 102006766.

It is an arithmetic number, because the mean of its divisors is an integer number (102006766).

Almost surely, 2^204013531 is an apocalyptic number.

204013531 is a deficient number, since it is larger than the sum of its proper divisors (1).

204013531 is an equidigital number, since it uses as much as digits as its factorization.

204013531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 204013531 is about 14283.3305289768. The cubic root of 204013531 is about 588.6895467309.

Adding to 204013531 its reverse (135310402), we get a palindrome (339323933).

It can be divided in two parts, 20401 and 3531, that added together give a palindrome (23932).

The spelling of 204013531 in words is "two hundred four million, thirteen thousand, five hundred thirty-one".