204562643 has 2 divisors, whose sum is σ = 204562644. Its totient is φ = 204562642.

The previous prime is 204562627. The next prime is 204562663. The reversal of 204562643 is 346265402.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 204562643 - 2⁴ = 204562627 is a prime.

It is a super-2 number, since 2×204562643² = 83691749822290898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (204562663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102281321 + 102281322.

It is an arithmetic number, because the mean of its divisors is an integer number (102281322).

Almost surely, 2^204562643 is an apocalyptic number.

204562643 is a deficient number, since it is larger than the sum of its proper divisors (1).

204562643 is an equidigital number, since it uses as much as digits as its factorization.

204562643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 204562643 is about 14302.5397395008. The cubic root of 204562643 is about 589.2172354348.

The spelling of 204562643 in words is "two hundred four million, five hundred sixty-two thousand, six hundred forty-three".