1797720481 has 4 divisors (see below), whose sum is σ = 1841567364. Its totient is φ = 1753873600.

The previous prime is 1797720451. The next prime is 1797720553. The reversal of 1797720481 is 1840277971.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1840277971 = 7 ⋅262896853.

It can be written as a sum of positive squares in 2 ways, for example, as 178462881 + 1619257600 = 13359^2 + 40240^2 .

It is a cyclic number.

It is not a de Polignac number, because 1797720481 - 2²⁵ = 1764166049 is a prime.

It is a super-2 number, since 2×1797720481² = 6463597855613742722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1797720401) 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, 21923380 + ... + 21923461.

It is an arithmetic number, because the mean of its divisors is an integer number (460391841).

Almost surely, 2^1797720481 is an apocalyptic number.

It is an amenable number.

1797720481 is a deficient number, since it is larger than the sum of its proper divisors (43846883).

1797720481 is an equidigital number, since it uses as much as digits as its factorization.

1797720481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43846882.

The product of its (nonzero) digits is 197568, while the sum is 46.

The square root of 1797720481 is about 42399.5339714955. The cubic root of 1797720481 is about 1215.9266823815.

The spelling of 1797720481 in words is "one billion, seven hundred ninety-seven million, seven hundred twenty thousand, four hundred eighty-one".