1721702051 has 4 divisors (see below), whose sum is σ = 1729422912. Its totient is φ = 1713981192.

The previous prime is 1721702041. The next prime is 1721702071. The reversal of 1721702051 is 1502071271.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1721702051 - 2⁶ = 1721701987 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1721702051.

It is not an unprimeable number, because it can be changed into a prime (1721702041) 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 in 3 ways as a sum of consecutive naturals, for example, 3860096 + ... + 3860541.

It is an arithmetic number, because the mean of its divisors is an integer number (432355728).

Almost surely, 2^1721702051 is an apocalyptic number.

1721702051 is a deficient number, since it is larger than the sum of its proper divisors (7720861).

1721702051 is an equidigital number, since it uses as much as digits as its factorization.

1721702051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7720860.

The product of its (nonzero) digits is 980, while the sum is 26.

The square root of 1721702051 is about 41493.3976796309. The cubic root of 1721702051 is about 1198.5403667139.

The spelling of 1721702051 in words is "one billion, seven hundred twenty-one million, seven hundred two thousand, fifty-one".