127998481 has 4 divisors (see below), whose sum is σ = 137844532. Its totient is φ = 118152432.

The previous prime is 127998469. The next prime is 127998499. The reversal of 127998481 is 184899721.

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

It can be written as a sum of positive squares in 2 ways, for example, as 30305025 + 97693456 = 5505^2 + 9884^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127998481 is a prime.

It is a super-2 number, since 2×127998481² = 32767222276614722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (127998461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4923006 + ... + 4923031.

It is an arithmetic number, because the mean of its divisors is an integer number (34461133).

Almost surely, 2^127998481 is an apocalyptic number.

It is an amenable number.

127998481 is a deficient number, since it is larger than the sum of its proper divisors (9846051).

127998481 is an equidigital number, since it uses as much as digits as its factorization.

127998481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9846050.

The product of its digits is 290304, while the sum is 49.

The square root of 127998481 is about 11313.6413678356. The cubic root of 127998481 is about 503.9664263875.

The spelling of 127998481 in words is "one hundred twenty-seven million, nine hundred ninety-eight thousand, four hundred eighty-one".