1721292473 has 2 divisors, whose sum is σ = 1721292474. Its totient is φ = 1721292472.

The previous prime is 1721292439. The next prime is 1721292499. The reversal of 1721292473 is 3742921271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1235663104 + 485629369 = 35152^2 + 22037^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721292473 - 2¹⁸ = 1721030329 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1721292413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860646236 + 860646237.

It is an arithmetic number, because the mean of its divisors is an integer number (860646237).

Almost surely, 2^1721292473 is an apocalyptic number.

It is an amenable number.

1721292473 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721292473 is an equidigital number, since it uses as much as digits as its factorization.

1721292473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 42336, while the sum is 38.

The square root of 1721292473 is about 41488.4619261789. The cubic root of 1721292473 is about 1198.4453183870.

The spelling of 1721292473 in words is "one billion, seven hundred twenty-one million, two hundred ninety-two thousand, four hundred seventy-three".