205453979 has 2 divisors, whose sum is σ = 205453980. Its totient is φ = 205453978.

The previous prime is 205453949. The next prime is 205453999. The reversal of 205453979 is 979354502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205453979 - 2²⁰ = 204405403 is a prime.

It is a super-2 number, since 2×205453979² = 84422674973864882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (205453949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102726989 + 102726990.

It is an arithmetic number, because the mean of its divisors is an integer number (102726990).

Almost surely, 2^205453979 is an apocalyptic number.

205453979 is a deficient number, since it is larger than the sum of its proper divisors (1).

205453979 is an equidigital number, since it uses as much as digits as its factorization.

205453979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 340200, while the sum is 44.

The square root of 205453979 is about 14333.6659302497. The cubic root of 205453979 is about 590.0717895983.

The spelling of 205453979 in words is "two hundred five million, four hundred fifty-three thousand, nine hundred seventy-nine".