204785131 has 2 divisors, whose sum is σ = 204785132. Its totient is φ = 204785130.

The previous prime is 204785107. The next prime is 204785149. The reversal of 204785131 is 131587402.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 204785131 - 2¹⁷ = 204654059 is a prime.

It is a super-2 number, since 2×204785131² = 83873899757374322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 204785093 and 204785102.

It is not a weakly prime, because it can be changed into another prime (204785431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102392565 + 102392566.

It is an arithmetic number, because the mean of its divisors is an integer number (102392566).

Almost surely, 2^204785131 is an apocalyptic number.

204785131 is a deficient number, since it is larger than the sum of its proper divisors (1).

204785131 is an equidigital number, since it uses as much as digits as its factorization.

204785131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 204785131 is about 14310.3155450884. The cubic root of 204785131 is about 589.4307743684.

It can be divided in two parts, 2047 and 85131, that added together give a palindrome (87178).

The spelling of 204785131 in words is "two hundred four million, seven hundred eighty-five thousand, one hundred thirty-one".