1791140639 has 2 divisors, whose sum is σ = 1791140640. Its totient is φ = 1791140638.

The previous prime is 1791140609. The next prime is 1791140641. The reversal of 1791140639 is 9360411971.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1791140639 - 2²⁰ = 1790092063 is a prime.

It is a Sophie Germain prime.

Together with 1791140641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1791140596 and 1791140605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1791140609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 895570319 + 895570320.

It is an arithmetic number, because the mean of its divisors is an integer number (895570320).

Almost surely, 2^1791140639 is an apocalyptic number.

1791140639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1791140639 is an equidigital number, since it uses as much as digits as its factorization.

1791140639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40824, while the sum is 41.

The square root of 1791140639 is about 42321.8695121092. The cubic root of 1791140639 is about 1214.4413965343.

The spelling of 1791140639 in words is "one billion, seven hundred ninety-one million, one hundred forty thousand, six hundred thirty-nine".