1721752049 has 2 divisors, whose sum is σ = 1721752050. Its totient is φ = 1721752048.

The previous prime is 1721752033. The next prime is 1721752057. The reversal of 1721752049 is 9402571271.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1588580449 + 133171600 = 39857^2 + 11540^2 .

It is an emirp because it is prime and its reverse (9402571271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1721752049 - 2⁴ = 1721752033 is a prime.

It is not a weakly prime, because it can be changed into another prime (1721052049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860876024 + 860876025.

It is an arithmetic number, because the mean of its divisors is an integer number (860876025).

Almost surely, 2^1721752049 is an apocalyptic number.

It is an amenable number.

1721752049 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721752049 is an equidigital number, since it uses as much as digits as its factorization.

1721752049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 38.

The square root of 1721752049 is about 41494.0001566492. Note that the first 3 decimals coincide. The cubic root of 1721752049 is about 1198.5519684196.

The spelling of 1721752049 in words is "one billion, seven hundred twenty-one million, seven hundred fifty-two thousand, forty-nine".