719981 has 2 divisors, whose sum is σ = 719982. Its totient is φ = 719980.

The previous prime is 719959. The next prime is 719989. The reversal of 719981 is 189917.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 586756 + 133225 = 766^2 + 365^2 .

It is a cyclic number.

It is not a de Polignac number, because 719981 - 2¹⁸ = 457837 is a prime.

It is a super-2 number, since 2×719981² = 1036745280722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (719989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359990 + 359991.

It is an arithmetic number, because the mean of its divisors is an integer number (359991).

2⁷¹⁹⁹⁸¹ is an apocalyptic number.

It is an amenable number.

719981 is a deficient number, since it is larger than the sum of its proper divisors (1).

719981 is an equidigital number, since it uses as much as digits as its factorization.

719981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4536, while the sum is 35.

The square root of 719981 is about 848.5169414926. The cubic root of 719981 is about 89.6273065289.

The spelling of 719981 in words is "seven hundred nineteen thousand, nine hundred eighty-one".