251042039 has 2 divisors, whose sum is σ = 251042040. Its totient is φ = 251042038.

The previous prime is 251042021. The next prime is 251042047. The reversal of 251042039 is 930240152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251042039 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 251041999 and 251042017.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251042059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125521019 + 125521020.

It is an arithmetic number, because the mean of its divisors is an integer number (125521020).

Almost surely, 2^251042039 is an apocalyptic number.

251042039 is a deficient number, since it is larger than the sum of its proper divisors (1).

251042039 is an equidigital number, since it uses as much as digits as its factorization.

251042039 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 251042039 is about 15844.3062012825. The cubic root of 251042039 is about 630.8345695991.

The spelling of 251042039 in words is "two hundred fifty-one million, forty-two thousand, thirty-nine".