205401851 has 2 divisors, whose sum is σ = 205401852. Its totient is φ = 205401850.

The previous prime is 205401787. The next prime is 205401857. The reversal of 205401851 is 158104502.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 205401851 - 2⁶ = 205401787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 205401851.

It is not a weakly prime, because it can be changed into another prime (205401857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102700925 + 102700926.

It is an arithmetic number, because the mean of its divisors is an integer number (102700926).

Almost surely, 2^205401851 is an apocalyptic number.

205401851 is a deficient number, since it is larger than the sum of its proper divisors (1).

205401851 is an equidigital number, since it uses as much as digits as its factorization.

205401851 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 205401851 is about 14331.8474384847. The cubic root of 205401851 is about 590.0218808317.

The spelling of 205401851 in words is "two hundred five million, four hundred one thousand, eight hundred fifty-one".