52566981 has 4 divisors (see below), whose sum is σ = 70089312. Its totient is φ = 35044652.

The previous prime is 52566953. The next prime is 52566991. The reversal of 52566981 is 18966525.

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 52566981 - 2⁵ = 52566949 is a prime.

It is a super-2 number, since 2×52566981² = 5526574982908722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52566911) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8761161 + ... + 8761166.

It is an arithmetic number, because the mean of its divisors is an integer number (17522328).

Almost surely, 2^52566981 is an apocalyptic number.

It is an amenable number.

52566981 is a deficient number, since it is larger than the sum of its proper divisors (17522331).

52566981 is a wasteful number, since it uses less digits than its factorization.

52566981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17522330.

The product of its digits is 129600, while the sum is 42.

The square root of 52566981 is about 7250.3090278967. The cubic root of 52566981 is about 374.6027936431.

The spelling of 52566981 in words is "fifty-two million, five hundred sixty-six thousand, nine hundred eighty-one".