721059791 has 2 divisors, whose sum is σ = 721059792. Its totient is φ = 721059790.

The previous prime is 721059719. The next prime is 721059797. The reversal of 721059791 is 197950127.

It is a happy number.

Together with previous prime (721059719) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is an emirp because it is prime and its reverse (197950127) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-721059791 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (721059797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360529895 + 360529896.

It is an arithmetic number, because the mean of its divisors is an integer number (360529896).

Almost surely, 2^721059791 is an apocalyptic number.

721059791 is a deficient number, since it is larger than the sum of its proper divisors (1).

721059791 is an equidigital number, since it uses as much as digits as its factorization.

721059791 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 39690, while the sum is 41.

The square root of 721059791 is about 26852.5565077145. The cubic root of 721059791 is about 896.7204885781.

The spelling of 721059791 in words is "seven hundred twenty-one million, fifty-nine thousand, seven hundred ninety-one".