251402279 has 2 divisors, whose sum is σ = 251402280. Its totient is φ = 251402278.

The previous prime is 251402257. The next prime is 251402299. The reversal of 251402279 is 972204152.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-251402279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (251402299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125701139 + 125701140.

It is an arithmetic number, because the mean of its divisors is an integer number (125701140).

Almost surely, 2^251402279 is an apocalyptic number.

251402279 is a deficient number, since it is larger than the sum of its proper divisors (1).

251402279 is an equidigital number, since it uses as much as digits as its factorization.

251402279 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 251402279 is about 15855.6702475802. The cubic root of 251402279 is about 631.1361701229.

The spelling of 251402279 in words is "two hundred fifty-one million, four hundred two thousand, two hundred seventy-nine".