204155521322531 has 2 divisors, whose sum is σ = 204155521322532. Its totient is φ = 204155521322530.

The previous prime is 204155521322443. The next prime is 204155521322561. The reversal of 204155521322531 is 135223125551402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204155521322531 - 2¹⁴ = 204155521306147 is a prime.

It is a super-2 number, since 2×204155521322531² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204155521322561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102077760661265 + 102077760661266.

It is an arithmetic number, because the mean of its divisors is an integer number (102077760661266).

Almost surely, 2^{204155521322531} is an apocalyptic number.

204155521322531 is a deficient number, since it is larger than the sum of its proper divisors (1).

204155521322531 is an equidigital number, since it uses as much as digits as its factorization.

204155521322531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 360000, while the sum is 41.

Adding to 204155521322531 its reverse (135223125551402), we get a palindrome (339378646873933).

The spelling of 204155521322531 in words is "two hundred four trillion, one hundred fifty-five billion, five hundred twenty-one million, three hundred twenty-two thousand, five hundred thirty-one".