254861021 has 2 divisors, whose sum is σ = 254861022. Its totient is φ = 254861020.

The previous prime is 254860987. The next prime is 254861029. The reversal of 254861021 is 120168452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 149572900 + 105288121 = 12230^2 + 10261^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-254861021 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254861029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127430510 + 127430511.

It is an arithmetic number, because the mean of its divisors is an integer number (127430511).

Almost surely, 2^254861021 is an apocalyptic number.

It is an amenable number.

254861021 is a deficient number, since it is larger than the sum of its proper divisors (1).

254861021 is an equidigital number, since it uses as much as digits as its factorization.

254861021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 254861021 is about 15964.3672282994. The cubic root of 254861021 is about 634.0173455368.

The spelling of 254861021 in words is "two hundred fifty-four million, eight hundred sixty-one thousand, twenty-one".