1720047481 has 4 divisors (see below), whose sum is σ = 1720316752. Its totient is φ = 1719778212.

The previous prime is 1720047421. The next prime is 1720047499. The reversal of 1720047481 is 1847400271.

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 1720047481 - 2⁷ = 1720047353 is a prime.

It is a super-2 number, since 2×1720047481² = 5917126673788890722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720047401) 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, 124815 + ... + 137908.

It is an arithmetic number, because the mean of its divisors is an integer number (430079188).

Almost surely, 2^1720047481 is an apocalyptic number.

It is an amenable number.

1720047481 is a deficient number, since it is larger than the sum of its proper divisors (269271).

1720047481 is an equidigital number, since it uses as much as digits as its factorization.

1720047481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269270.

The product of its (nonzero) digits is 12544, while the sum is 34.

The square root of 1720047481 is about 41473.4551369909. The cubic root of 1720047481 is about 1198.1563079040.

The spelling of 1720047481 in words is "one billion, seven hundred twenty million, forty-seven thousand, four hundred eighty-one".