204520145231 has 4 divisors (see below), whose sum is σ = 204596376072. Its totient is φ = 204443914392.

The previous prime is 204520145119. The next prime is 204520145251. The reversal of 204520145231 is 132541025402.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204520145231 - 2²⁶ = 204453036367 is a prime.

It is a super-2 number, since 2×204520145231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 204520145194 and 204520145203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204520145251) 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, 38111396 + ... + 38116761.

It is an arithmetic number, because the mean of its divisors is an integer number (51149094018).

Almost surely, 2^204520145231 is an apocalyptic number.

204520145231 is a deficient number, since it is larger than the sum of its proper divisors (76230841).

204520145231 is an equidigital number, since it uses as much as digits as its factorization.

204520145231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76230840.

The product of its (nonzero) digits is 9600, while the sum is 29.

The spelling of 204520145231 in words is "two hundred four billion, five hundred twenty million, one hundred forty-five thousand, two hundred thirty-one".