251271717139 has 2 divisors, whose sum is σ = 251271717140. Its totient is φ = 251271717138.

The previous prime is 251271717107. The next prime is 251271717149. The reversal of 251271717139 is 931717172152.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 251271717139 - 2⁵ = 251271717107 is a prime.

It is not a weakly prime, because it can be changed into another prime (251271717149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 125635858569 + 125635858570.

It is an arithmetic number, because the mean of its divisors is an integer number (125635858570).

Almost surely, 2^251271717139 is an apocalyptic number.

251271717139 is a deficient number, since it is larger than the sum of its proper divisors (1).

251271717139 is an equidigital number, since it uses as much as digits as its factorization.

251271717139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 185220, while the sum is 46.

The spelling of 251271717139 in words is "two hundred fifty-one billion, two hundred seventy-one million, seven hundred seventeen thousand, one hundred thirty-nine".