1391275139 has 4 divisors (see below), whose sum is σ = 1394180160. Its totient is φ = 1388370120.

The previous prime is 1391275111. The next prime is 1391275183. The reversal of 1391275139 is 9315721931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9315721931 = 17 ⋅547983643.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1391275139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1391275096 and 1391275105.

It is not an unprimeable number, because it can be changed into a prime (1391278139) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1451792 + ... + 1452749.

It is an arithmetic number, because the mean of its divisors is an integer number (348545040).

Almost surely, 2^1391275139 is an apocalyptic number.

1391275139 is a deficient number, since it is larger than the sum of its proper divisors (2905021).

1391275139 is an equidigital number, since it uses as much as digits as its factorization.

1391275139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2905020.

The product of its digits is 51030, while the sum is 41.

The square root of 1391275139 is about 37299.8007903528. The cubic root of 1391275139 is about 1116.3601916595.

The spelling of 1391275139 in words is "one billion, three hundred ninety-one million, two hundred seventy-five thousand, one hundred thirty-nine".