52197681 has 4 divisors (see below), whose sum is σ = 69596912. Its totient is φ = 34798452.

The previous prime is 52197679. The next prime is 52197721. The reversal of 52197681 is 18679125.

52197681 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 not a de Polignac number, because 52197681 - 2¹ = 52197679 is a prime.

It is a super-2 number, since 2×52197681² = 5449195803555522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52197601) 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, 8699611 + ... + 8699616.

It is an arithmetic number, because the mean of its divisors is an integer number (17399228).

Almost surely, 2^52197681 is an apocalyptic number.

It is an amenable number.

52197681 is a deficient number, since it is larger than the sum of its proper divisors (17399231).

52197681 is a wasteful number, since it uses less digits than its factorization.

52197681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17399230.

The product of its digits is 30240, while the sum is 39.

The square root of 52197681 is about 7224.7962601031. The cubic root of 52197681 is about 373.7234961426.

The spelling of 52197681 in words is "fifty-two million, one hundred ninety-seven thousand, six hundred eighty-one".