254139961 has 2 divisors, whose sum is σ = 254139962. Its totient is φ = 254139960.

The previous prime is 254139959. The next prime is 254139967. The reversal of 254139961 is 169931452.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 210830400 + 43309561 = 14520^2 + 6581^2 .

It is a cyclic number.

It is not a de Polignac number, because 254139961 - 2¹ = 254139959 is a prime.

Together with 254139959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (254139967) 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, 127069980 + 127069981.

It is an arithmetic number, because the mean of its divisors is an integer number (127069981).

Almost surely, 2^254139961 is an apocalyptic number.

It is an amenable number.

254139961 is a deficient number, since it is larger than the sum of its proper divisors (1).

254139961 is an equidigital number, since it uses as much as digits as its factorization.

254139961 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58320, while the sum is 40.

The square root of 254139961 is about 15941.7678128870. The cubic root of 254139961 is about 633.4188541639.

The spelling of 254139961 in words is "two hundred fifty-four million, one hundred thirty-nine thousand, nine hundred sixty-one".