205404971 has 2 divisors, whose sum is σ = 205404972. Its totient is φ = 205404970.

The previous prime is 205404961. The next prime is 205405001. The reversal of 205404971 is 179404502.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205404971 is a prime.

It is a super-2 number, since 2×205404971² = 84382404223021682, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205404911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102702485 + 102702486.

It is an arithmetic number, because the mean of its divisors is an integer number (102702486).

Almost surely, 2^205404971 is an apocalyptic number.

205404971 is a deficient number, since it is larger than the sum of its proper divisors (1).

205404971 is an equidigital number, since it uses as much as digits as its factorization.

205404971 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 205404971 is about 14331.9562865647. The cubic root of 205404971 is about 590.0248682422.

The spelling of 205404971 in words is "two hundred five million, four hundred four thousand, nine hundred seventy-one".