720715381 has 2 divisors, whose sum is σ = 720715382. Its totient is φ = 720715380.

The previous prime is 720715379. The next prime is 720715403. The reversal of 720715381 is 183517027.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 699867025 + 20848356 = 26455^2 + 4566^2 .

It is a cyclic number.

It is not a de Polignac number, because 720715381 - 2¹ = 720715379 is a prime.

It is a super-2 number, since 2×720715381² = 1038861320819950322, which contains 22 as substring.

Together with 720715379, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720715301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360357690 + 360357691.

It is an arithmetic number, because the mean of its divisors is an integer number (360357691).

Almost surely, 2^720715381 is an apocalyptic number.

It is an amenable number.

720715381 is a deficient number, since it is larger than the sum of its proper divisors (1).

720715381 is an equidigital number, since it uses as much as digits as its factorization.

720715381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 34.

The square root of 720715381 is about 26846.1427583182. The cubic root of 720715381 is about 896.5776947386.

The spelling of 720715381 in words is "seven hundred twenty million, seven hundred fifteen thousand, three hundred eighty-one".