1720722349 has 2 divisors, whose sum is σ = 1720722350. Its totient is φ = 1720722348.

The previous prime is 1720722313. The next prime is 1720722361. The reversal of 1720722349 is 9432270271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1191492324 + 529230025 = 34518^2 + 23005^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720722349 - 2²¹ = 1718625197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720722389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860361174 + 860361175.

It is an arithmetic number, because the mean of its divisors is an integer number (860361175).

Almost surely, 2^1720722349 is an apocalyptic number.

It is an amenable number.

1720722349 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720722349 is an equidigital number, since it uses as much as digits as its factorization.

1720722349 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 1720722349 is about 41481.5904830082. The cubic root of 1720722349 is about 1198.3129880016.

The spelling of 1720722349 in words is "one billion, seven hundred twenty million, seven hundred twenty-two thousand, three hundred forty-nine".