254515021 has 2 divisors, whose sum is σ = 254515022. Its totient is φ = 254515020.

The previous prime is 254514989. The next prime is 254515031. The reversal of 254515021 is 120515452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 201952521 + 52562500 = 14211^2 + 7250^2 .

It is a cyclic number.

It is not a de Polignac number, because 254515021 - 2⁵ = 254514989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254515031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127257510 + 127257511.

It is an arithmetic number, because the mean of its divisors is an integer number (127257511).

Almost surely, 2^254515021 is an apocalyptic number.

It is an amenable number.

254515021 is a deficient number, since it is larger than the sum of its proper divisors (1).

254515021 is an equidigital number, since it uses as much as digits as its factorization.

254515021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2000, while the sum is 25.

The square root of 254515021 is about 15953.5269141341. The cubic root of 254515021 is about 633.7303010552.

The spelling of 254515021 in words is "two hundred fifty-four million, five hundred fifteen thousand, twenty-one".