254871821 has 2 divisors, whose sum is σ = 254871822. Its totient is φ = 254871820.

The previous prime is 254871817. The next prime is 254871823. The reversal of 254871821 is 128178452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 249987721 + 4884100 = 15811^2 + 2210^2 .

It is a cyclic number.

It is not a de Polignac number, because 254871821 - 2² = 254871817 is a prime.

Together with 254871823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254871823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127435910 + 127435911.

It is an arithmetic number, because the mean of its divisors is an integer number (127435911).

Almost surely, 2^254871821 is an apocalyptic number.

It is an amenable number.

254871821 is a deficient number, since it is larger than the sum of its proper divisors (1).

254871821 is an equidigital number, since it uses as much as digits as its factorization.

254871821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 35840, while the sum is 38.

The square root of 254871821 is about 15964.7054780224. The cubic root of 254871821 is about 634.0263011244.

The spelling of 254871821 in words is "two hundred fifty-four million, eight hundred seventy-one thousand, eight hundred twenty-one".