204155132105531 has 2 divisors, whose sum is σ = 204155132105532. Its totient is φ = 204155132105530.

The previous prime is 204155132105527. The next prime is 204155132105567. The reversal of 204155132105531 is 135501231551402.

204155132105531 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204155132105531 - 2² = 204155132105527 is a prime.

It is a super-2 number, since 2×204155132105531² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204155132105731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102077566052765 + 102077566052766.

It is an arithmetic number, because the mean of its divisors is an integer number (102077566052766).

Almost surely, 2^{204155132105531} is an apocalyptic number.

204155132105531 is a deficient number, since it is larger than the sum of its proper divisors (1).

204155132105531 is an equidigital number, since it uses as much as digits as its factorization.

204155132105531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 90000, while the sum is 38.

Adding to 204155132105531 its reverse (135501231551402), we get a palindrome (339656363656933).

The spelling of 204155132105531 in words is "two hundred four trillion, one hundred fifty-five billion, one hundred thirty-two million, one hundred five thousand, five hundred thirty-one".