1722331397 has 2 divisors, whose sum is σ = 1722331398. Its totient is φ = 1722331396.

The previous prime is 1722331393. The next prime is 1722331409. The reversal of 1722331397 is 7931332271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1284433921 + 437897476 = 35839^2 + 20926^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722331397 - 2² = 1722331393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1722331397.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1722331393) 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, 861165698 + 861165699.

It is an arithmetic number, because the mean of its divisors is an integer number (861165699).

Almost surely, 2^1722331397 is an apocalyptic number.

It is an amenable number.

1722331397 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722331397 is an equidigital number, since it uses as much as digits as its factorization.

1722331397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 47628, while the sum is 38.

The square root of 1722331397 is about 41500.9806751600. The cubic root of 1722331397 is about 1198.6863859194.

The spelling of 1722331397 in words is "one billion, seven hundred twenty-two million, three hundred thirty-one thousand, three hundred ninety-seven".