705497831 has 2 divisors, whose sum is σ = 705497832. Its totient is φ = 705497830.

The previous prime is 705497809. The next prime is 705497843. The reversal of 705497831 is 138794507.

It is a strong prime.

It is an emirp because it is prime and its reverse (138794507) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-705497831 is a prime.

It is a super-2 number, since 2×705497831² = 995454379091409122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (705497851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352748915 + 352748916.

It is an arithmetic number, because the mean of its divisors is an integer number (352748916).

Almost surely, 2^705497831 is an apocalyptic number.

705497831 is a deficient number, since it is larger than the sum of its proper divisors (1).

705497831 is an equidigital number, since it uses as much as digits as its factorization.

705497831 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 705497831 is about 26561.2091403987. The cubic root of 705497831 is about 890.2224882470. Note that the first 3 decimals are identical.

The spelling of 705497831 in words is "seven hundred five million, four hundred ninety-seven thousand, eight hundred thirty-one".