1873353721 has 2 divisors, whose sum is σ = 1873353722. Its totient is φ = 1873353720.

The previous prime is 1873353707. The next prime is 1873353731. The reversal of 1873353721 is 1273533781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1599120121 + 274233600 = 39989^2 + 16560^2 .

It is a cyclic number.

It is not a de Polignac number, because 1873353721 - 2¹¹ = 1873351673 is a prime.

It is not a weakly prime, because it can be changed into another prime (1873353731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936676860 + 936676861.

It is an arithmetic number, because the mean of its divisors is an integer number (936676861).

Almost surely, 2^1873353721 is an apocalyptic number.

It is an amenable number.

1873353721 is a deficient number, since it is larger than the sum of its proper divisors (1).

1873353721 is an equidigital number, since it uses as much as digits as its factorization.

1873353721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 40.

The square root of 1873353721 is about 43282.2564222338. The cubic root of 1873353721 is about 1232.7450360989.

The spelling of 1873353721 in words is "one billion, eight hundred seventy-three million, three hundred fifty-three thousand, seven hundred twenty-one".