204090961 has 2 divisors, whose sum is σ = 204090962. Its totient is φ = 204090960.

The previous prime is 204090923. The next prime is 204090979. The reversal of 204090961 is 169090402.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 137358400 + 66732561 = 11720^2 + 8169^2 .

It is a cyclic number.

It is not a de Polignac number, because 204090961 - 2¹⁵ = 204058193 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (204090461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102045480 + 102045481.

It is an arithmetic number, because the mean of its divisors is an integer number (102045481).

Almost surely, 2^204090961 is an apocalyptic number.

It is an amenable number.

204090961 is a deficient number, since it is larger than the sum of its proper divisors (1).

204090961 is an equidigital number, since it uses as much as digits as its factorization.

204090961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 204090961 is about 14286.0407741263. The cubic root of 204090961 is about 588.7640131416.

The spelling of 204090961 in words is "two hundred four million, ninety thousand, nine hundred sixty-one".