716641781 has 2 divisors, whose sum is σ = 716641782. Its totient is φ = 716641780.

The previous prime is 716641733. The next prime is 716641831. The reversal of 716641781 is 187146617.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 588838756 + 127803025 = 24266^2 + 11305^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-716641781 is a prime.

It is a super-2 number, since 2×716641781² = 1027150884549703922, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (716641711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358320890 + 358320891.

It is an arithmetic number, because the mean of its divisors is an integer number (358320891).

Almost surely, 2^716641781 is an apocalyptic number.

It is an amenable number.

716641781 is a deficient number, since it is larger than the sum of its proper divisors (1).

716641781 is an equidigital number, since it uses as much as digits as its factorization.

716641781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56448, while the sum is 41.

The square root of 716641781 is about 26770.1658754667. The cubic root of 716641781 is about 894.8853014069.

The spelling of 716641781 in words is "seven hundred sixteen million, six hundred forty-one thousand, seven hundred eighty-one".