7791139 has 2 divisors, whose sum is σ = 7791140. Its totient is φ = 7791138.

The previous prime is 7791109. The next prime is 7791233. The reversal of 7791139 is 9311977.

It is a weak prime.

It is an emirp because it is prime and its reverse (9311977) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7791139 - 2¹⁵ = 7758371 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 7791098 and 7791107.

It is not a weakly prime, because it can be changed into another prime (7791109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3895569 + 3895570.

It is an arithmetic number, because the mean of its divisors is an integer number (3895570).

Almost surely, 2^7791139 is an apocalyptic number.

7791139 is a deficient number, since it is larger than the sum of its proper divisors (1).

7791139 is an equidigital number, since it uses as much as digits as its factorization.

7791139 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11907, while the sum is 37.

The square root of 7791139 is about 2791.2611844827. The cubic root of 7791139 is about 198.2441212284.

The spelling of 7791139 in words is "seven million, seven hundred ninety-one thousand, one hundred thirty-nine".