52781399 has 4 divisors (see below), whose sum is σ = 57579720. Its totient is φ = 47983080.

The previous prime is 52781387. The next prime is 52781419. The reversal of 52781399 is 99318725.

52781399 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52781399 is a prime.

It is a super-3 number, since 3×52781399³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52781369) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2399144 + ... + 2399165.

It is an arithmetic number, because the mean of its divisors is an integer number (14394930).

Almost surely, 2^52781399 is an apocalyptic number.

52781399 is a deficient number, since it is larger than the sum of its proper divisors (4798321).

52781399 is a wasteful number, since it uses less digits than its factorization.

52781399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4798320.

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

The square root of 52781399 is about 7265.0807978989. The cubic root of 52781399 is about 375.1114311813. Note that the first 3 decimals are identical.

The spelling of 52781399 in words is "fifty-two million, seven hundred eighty-one thousand, three hundred ninety-nine".