1721971793 has 4 divisors (see below), whose sum is σ = 1725894720. Its totient is φ = 1718048868.

The previous prime is 1721971777. The next prime is 1721971799. The reversal of 1721971793 is 3971791271.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1721971793 - 2⁴ = 1721971777 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1721971799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1960805 + ... + 1961682.

It is an arithmetic number, because the mean of its divisors is an integer number (431473680).

Almost surely, 2^1721971793 is an apocalyptic number.

It is an amenable number.

1721971793 is a deficient number, since it is larger than the sum of its proper divisors (3922927).

1721971793 is an equidigital number, since it uses as much as digits as its factorization.

1721971793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3922926.

The product of its digits is 166698, while the sum is 47.

The square root of 1721971793 is about 41496.6479730592. The cubic root of 1721971793 is about 1198.6029559006.

The spelling of 1721971793 in words is "one billion, seven hundred twenty-one million, nine hundred seventy-one thousand, seven hundred ninety-three".