1722648973 has 2 divisors, whose sum is σ = 1722648974. Its totient is φ = 1722648972.

The previous prime is 1722648937. The next prime is 1722648979. The reversal of 1722648973 is 3798462271.

It is a happy number.

Together with previous prime (1722648937) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1111422244 + 611226729 = 33338^2 + 24723^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1722648973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1722648979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861324486 + 861324487.

It is an arithmetic number, because the mean of its divisors is an integer number (861324487).

Almost surely, 2^1722648973 is an apocalyptic number.

It is an amenable number.

1722648973 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722648973 is an equidigital number, since it uses as much as digits as its factorization.

1722648973 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 49.

The square root of 1722648973 is about 41504.8066252573. The cubic root of 1722648973 is about 1198.7600555654.

The spelling of 1722648973 in words is "one billion, seven hundred twenty-two million, six hundred forty-eight thousand, nine hundred seventy-three".