1715256139 has 2 divisors, whose sum is σ = 1715256140. Its totient is φ = 1715256138.

The previous prime is 1715256131. The next prime is 1715256143. The reversal of 1715256139 is 9316525171.

It is a strong prime.

It is an emirp because it is prime and its reverse (9316525171) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1715256139 - 2³ = 1715256131 is a prime.

It is not a weakly prime, because it can be changed into another prime (1715256131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 857628069 + 857628070.

It is an arithmetic number, because the mean of its divisors is an integer number (857628070).

Almost surely, 2^1715256139 is an apocalyptic number.

1715256139 is a deficient number, since it is larger than the sum of its proper divisors (1).

1715256139 is an equidigital number, since it uses as much as digits as its factorization.

1715256139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56700, while the sum is 40.

The square root of 1715256139 is about 41415.6508943177. The cubic root of 1715256139 is about 1197.0427503915.

The spelling of 1715256139 in words is "one billion, seven hundred fifteen million, two hundred fifty-six thousand, one hundred thirty-nine".