719720069 has 2 divisors, whose sum is σ = 719720070. Its totient is φ = 719720068.

The previous prime is 719720039. The next prime is 719720077. The reversal of 719720069 is 960027917.

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., 402523969 + 317196100 = 20063^2 + 17810^2 .

It is a cyclic number.

It is not a de Polignac number, because 719720069 - 2¹² = 719715973 is a prime.

It is a super-2 number, since 2×719720069² = 1035993955442729522, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (719720039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 359860034 + 359860035.

It is an arithmetic number, because the mean of its divisors is an integer number (359860035).

Almost surely, 2^719720069 is an apocalyptic number.

It is an amenable number.

719720069 is a deficient number, since it is larger than the sum of its proper divisors (1).

719720069 is an equidigital number, since it uses as much as digits as its factorization.

719720069 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47628, while the sum is 41.

The square root of 719720069 is about 26827.5990166843. The cubic root of 719720069 is about 896.1647783183.

The spelling of 719720069 in words is "seven hundred nineteen million, seven hundred twenty thousand, sixty-nine".