716581 has 2 divisors, whose sum is σ = 716582. Its totient is φ = 716580.

The previous prime is 716563. The next prime is 716591. The reversal of 716581 is 185617.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 695556 + 21025 = 834^2 + 145^2 .

It is a cyclic number.

It is not a de Polignac number, because 716581 - 2⁵ = 716549 is a prime.

It is a super-2 number, since 2×716581² = 1026976659122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (716501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 358290 + 358291.

It is an arithmetic number, because the mean of its divisors is an integer number (358291).

2⁷¹⁶⁵⁸¹ is an apocalyptic number.

It is an amenable number.

716581 is a deficient number, since it is larger than the sum of its proper divisors (1).

716581 is an equidigital number, since it uses as much as digits as its factorization.

716581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 28.

The square root of 716581 is about 846.5110749423. The cubic root of 716581 is about 89.4860001197.

The spelling of 716581 in words is "seven hundred sixteen thousand, five hundred eighty-one".