720694493 has 2 divisors, whose sum is σ = 720694494. Its totient is φ = 720694492.

The previous prime is 720694459. The next prime is 720694501. The reversal of 720694493 is 394496027.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 704477764 + 16216729 = 26542^2 + 4027^2 .

It is an emirp because it is prime and its reverse (394496027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720694493 - 2⁸ = 720694237 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720694693) 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, 360347246 + 360347247.

It is an arithmetic number, because the mean of its divisors is an integer number (360347247).

Almost surely, 2^720694493 is an apocalyptic number.

It is an amenable number.

720694493 is a deficient number, since it is larger than the sum of its proper divisors (1).

720694493 is an equidigital number, since it uses as much as digits as its factorization.

720694493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 326592, while the sum is 44.

The square root of 720694493 is about 26845.7537238201. The cubic root of 720694493 is about 896.5690330226.

The spelling of 720694493 in words is "seven hundred twenty million, six hundred ninety-four thousand, four hundred ninety-three".