722005391 has 2 divisors, whose sum is σ = 722005392. Its totient is φ = 722005390.

The previous prime is 722005381. The next prime is 722005409. The reversal of 722005391 is 193500227.

It is a weak prime.

It is an emirp because it is prime and its reverse (193500227) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 722005391 - 2¹⁸ = 721743247 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 (722005331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361002695 + 361002696.

It is an arithmetic number, because the mean of its divisors is an integer number (361002696).

Almost surely, 2^722005391 is an apocalyptic number.

722005391 is a deficient number, since it is larger than the sum of its proper divisors (1).

722005391 is an equidigital number, since it uses as much as digits as its factorization.

722005391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 722005391 is about 26870.1580010241. The cubic root of 722005391 is about 897.1123046758.

The spelling of 722005391 in words is "seven hundred twenty-two million, five thousand, three hundred ninety-one".