1722864421 has 2 divisors, whose sum is σ = 1722864422. Its totient is φ = 1722864420.

The previous prime is 1722864389. The next prime is 1722864431. The reversal of 1722864421 is 1244682271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 966339396 + 756525025 = 31086^2 + 27505^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722864421 - 2⁵ = 1722864389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1722864431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861432210 + 861432211.

It is an arithmetic number, because the mean of its divisors is an integer number (861432211).

Almost surely, 2^1722864421 is an apocalyptic number.

It is an amenable number.

1722864421 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722864421 is an equidigital number, since it uses as much as digits as its factorization.

1722864421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 1722864421 is about 41507.4020025344. The cubic root of 1722864421 is about 1198.8100289289.

The spelling of 1722864421 in words is "one billion, seven hundred twenty-two million, eight hundred sixty-four thousand, four hundred twenty-one".