52209181 has 4 divisors (see below), whose sum is σ = 53423392. Its totient is φ = 50994972.

The previous prime is 52209173. The next prime is 52209197. The reversal of 52209181 is 18190225.

52209181 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, 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 52209181 - 2³ = 52209173 is a prime.

It is a super-2 number, since 2×52209181² = 5451597161381522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52209881) 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, 607041 + ... + 607126.

It is an arithmetic number, because the mean of its divisors is an integer number (13355848).

Almost surely, 2^52209181 is an apocalyptic number.

It is an amenable number.

52209181 is a deficient number, since it is larger than the sum of its proper divisors (1214211).

52209181 is a wasteful number, since it uses less digits than its factorization.

52209181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214210.

The product of its (nonzero) digits is 1440, while the sum is 28.

The square root of 52209181 is about 7225.5920864660. The cubic root of 52209181 is about 373.7509399200.

The spelling of 52209181 in words is "fifty-two million, two hundred nine thousand, one hundred eighty-one".