254640557 has 2 divisors, whose sum is σ = 254640558. Its totient is φ = 254640556.

The previous prime is 254640523. The next prime is 254640559. The reversal of 254640557 is 755046452.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 158482921 + 96157636 = 12589^2 + 9806^2 .

It is a cyclic number.

It is not a de Polignac number, because 254640557 - 2⁸ = 254640301 is a prime.

It is a super-3 number, since 3×254640557³ (a number of 26 digits) contains 333 as substring.

Together with 254640559, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 254640557.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (254640559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127320278 + 127320279.

It is an arithmetic number, because the mean of its divisors is an integer number (127320279).

Almost surely, 2^254640557 is an apocalyptic number.

It is an amenable number.

254640557 is a deficient number, since it is larger than the sum of its proper divisors (1).

254640557 is an equidigital number, since it uses as much as digits as its factorization.

254640557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 168000, while the sum is 38.

The square root of 254640557 is about 15957.4608569158. The cubic root of 254640557 is about 633.8344768198.

The spelling of 254640557 in words is "two hundred fifty-four million, six hundred forty thousand, five hundred fifty-seven".