205420651 has 2 divisors, whose sum is σ = 205420652. Its totient is φ = 205420650.

The previous prime is 205420583. The next prime is 205420667. The reversal of 205420651 is 156024502.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-205420651 is a prime.

It is not a weakly prime, because it can be changed into another prime (205420681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102710325 + 102710326.

It is an arithmetic number, because the mean of its divisors is an integer number (102710326).

Almost surely, 2^205420651 is an apocalyptic number.

205420651 is a deficient number, since it is larger than the sum of its proper divisors (1).

205420651 is an equidigital number, since it uses as much as digits as its factorization.

205420651 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 205420651 is about 14332.5033054244. The cubic root of 205420651 is about 590.0398814370.

The spelling of 205420651 in words is "two hundred five million, four hundred twenty thousand, six hundred fifty-one".