705972391 has 2 divisors, whose sum is σ = 705972392. Its totient is φ = 705972390.

The previous prime is 705972329. The next prime is 705972427. The reversal of 705972391 is 193279507.

It is a strong prime.

It is an emirp because it is prime and its reverse (193279507) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 705972391 - 2²⁵ = 672417959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705972791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352986195 + 352986196.

It is an arithmetic number, because the mean of its divisors is an integer number (352986196).

Almost surely, 2^705972391 is an apocalyptic number.

705972391 is a deficient number, since it is larger than the sum of its proper divisors (1).

705972391 is an equidigital number, since it uses as much as digits as its factorization.

705972391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 119070, while the sum is 43.

The square root of 705972391 is about 26570.1409668824. The cubic root of 705972391 is about 890.4220491225.

The spelling of 705972391 in words is "seven hundred five million, nine hundred seventy-two thousand, three hundred ninety-one".