53997281 has 8 divisors (see below), whose sum is σ = 58751784. Its totient is φ = 49328640.

The previous prime is 53997277. The next prime is 53997323. The reversal of 53997281 is 18279935.

It can be written as a sum of positive squares in 4 ways, for example, as 707281 + 53290000 = 841^2 + 7300^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53997281 - 2² = 53997277 is a prime.

It is a super-2 number, since 2×53997281² = 5831412710785922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (53997271) 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 7 ways as a sum of consecutive naturals, for example, 20150 + ... + 22671.

It is an arithmetic number, because the mean of its divisors is an integer number (7343973).

Almost surely, 2^53997281 is an apocalyptic number.

It is an amenable number.

53997281 is a deficient number, since it is larger than the sum of its proper divisors (4754503).

53997281 is a wasteful number, since it uses less digits than its factorization.

53997281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42931.

The product of its digits is 136080, while the sum is 44.

The square root of 53997281 is about 7348.2842215037. The cubic root of 53997281 is about 377.9699709262.

The spelling of 53997281 in words is "fifty-three million, nine hundred ninety-seven thousand, two hundred eighty-one".