721504367 has 2 divisors, whose sum is σ = 721504368. Its totient is φ = 721504366.

The previous prime is 721504351. The next prime is 721504373. The reversal of 721504367 is 763405127.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 721504367 - 2⁴ = 721504351 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721504387) 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, 360752183 + 360752184.

It is an arithmetic number, because the mean of its divisors is an integer number (360752184).

Almost surely, 2^721504367 is an apocalyptic number.

721504367 is a deficient number, since it is larger than the sum of its proper divisors (1).

721504367 is an equidigital number, since it uses as much as digits as its factorization.

721504367 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 721504367 is about 26860.8333266114. The cubic root of 721504367 is about 896.9047444509.

The spelling of 721504367 in words is "seven hundred twenty-one million, five hundred four thousand, three hundred sixty-seven".