254818021 has 2 divisors, whose sum is σ = 254818022. Its totient is φ = 254818020.

The previous prime is 254817917. The next prime is 254818027. The reversal of 254818021 is 120818452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202037796 + 52780225 = 14214^2 + 7265^2 .

It is a cyclic number.

It is not a de Polignac number, because 254818021 - 2¹⁵ = 254785253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254818027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127409010 + 127409011.

It is an arithmetic number, because the mean of its divisors is an integer number (127409011).

Almost surely, 2^254818021 is an apocalyptic number.

It is an amenable number.

254818021 is a deficient number, since it is larger than the sum of its proper divisors (1).

254818021 is an equidigital number, since it uses as much as digits as its factorization.

254818021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 254818021 is about 15963.0204222133. The cubic root of 254818021 is about 633.9816865213.

The spelling of 254818021 in words is "two hundred fifty-four million, eight hundred eighteen thousand, twenty-one".