707500721 has 2 divisors, whose sum is σ = 707500722. Its totient is φ = 707500720.

The previous prime is 707500699. The next prime is 707500789. The reversal of 707500721 is 127005707.

707500721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 643180321 + 64320400 = 25361^2 + 8020^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-707500721 is a prime.

It is not a weakly prime, because it can be changed into another prime (707500121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 353750360 + 353750361.

It is an arithmetic number, because the mean of its divisors is an integer number (353750361).

Almost surely, 2^707500721 is an apocalyptic number.

It is an amenable number.

707500721 is a deficient number, since it is larger than the sum of its proper divisors (1).

707500721 is an equidigital number, since it uses as much as digits as its factorization.

707500721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 707500721 is about 26598.8857097436. The cubic root of 707500721 is about 891.0641317805.

The spelling of 707500721 in words is "seven hundred seven million, five hundred thousand, seven hundred twenty-one".