205122725 has 12 divisors (see below), whose sum is σ = 254554020. Its totient is φ = 163968000.

The previous prime is 205122721. The next prime is 205122739. The reversal of 205122725 is 527221502.

It can be written as a sum of positive squares in 6 ways, for example, as 14737921 + 190384804 = 3839^2 + 13798^2 .

It is not a de Polignac number, because 205122725 - 2² = 205122721 is a prime.

It is a super-2 number, since 2×205122725² = 84150664622851250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205122694 and 205122703.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205122721) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40325 + ... + 45125.

It is an arithmetic number, because the mean of its divisors is an integer number (21212835).

Almost surely, 2^205122725 is an apocalyptic number.

205122725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205122725 is a deficient number, since it is larger than the sum of its proper divisors (49431295).

205122725 is a wasteful number, since it uses less digits than its factorization.

205122725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6520 (or 6515 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 26.

The square root of 205122725 is about 14322.1061649466. The cubic root of 205122725 is about 589.7544942368.

The spelling of 205122725 in words is "two hundred five million, one hundred twenty-two thousand, seven hundred twenty-five".