1721419873 has 2 divisors, whose sum is σ = 1721419874. Its totient is φ = 1721419872.

The previous prime is 1721419871. The next prime is 1721419877. The reversal of 1721419873 is 3789141271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1716610624 + 4809249 = 41432^2 + 2193^2 .

It is a cyclic number.

It is not a de Polignac number, because 1721419873 - 2¹ = 1721419871 is a prime.

It is a super-2 number, since 2×1721419873² = 5926572758318672258, which contains 22 as substring.

Together with 1721419871, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1721419871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860709936 + 860709937.

It is an arithmetic number, because the mean of its divisors is an integer number (860709937).

Almost surely, 2^1721419873 is an apocalyptic number.

It is an amenable number.

1721419873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721419873 is an equidigital number, since it uses as much as digits as its factorization.

1721419873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 84672, while the sum is 43.

The square root of 1721419873 is about 41489.9972644010. The cubic root of 1721419873 is about 1198.4748849616.

The spelling of 1721419873 in words is "one billion, seven hundred twenty-one million, four hundred nineteen thousand, eight hundred seventy-three".