705515981 has 2 divisors, whose sum is σ = 705515982. Its totient is φ = 705515980.

The previous prime is 705515957. The next prime is 705515989. The reversal of 705515981 is 189515507.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 702727081 + 2788900 = 26509^2 + 1670^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-705515981 is a prime.

It is a super-2 number, since 2×705515981² = 995505598892784722, 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 (705515989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 352757990 + 352757991.

It is an arithmetic number, because the mean of its divisors is an integer number (352757991).

Almost surely, 2^705515981 is an apocalyptic number.

It is an amenable number.

705515981 is a deficient number, since it is larger than the sum of its proper divisors (1).

705515981 is an equidigital number, since it uses as much as digits as its factorization.

705515981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 41.

The square root of 705515981 is about 26561.5508018640. The cubic root of 705515981 is about 890.2301222887.

The spelling of 705515981 in words is "seven hundred five million, five hundred fifteen thousand, nine hundred eighty-one".