52066981 has 4 divisors (see below), whose sum is σ = 52603852. Its totient is φ = 51530112.

The previous prime is 52066967. The next prime is 52067017. The reversal of 52066981 is 18966025.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19061956 + 33005025 = 4366^2 + 5745^2 .

It is a cyclic number.

It is not a de Polignac number, because 52066981 - 2⁷ = 52066853 is a prime.

It is a super-4 number, since 4×52066981⁴ (a number of 32 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 52066981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52066901) 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, 268290 + ... + 268483.

It is an arithmetic number, because the mean of its divisors is an integer number (13150963).

Almost surely, 2^52066981 is an apocalyptic number.

It is an amenable number.

52066981 is a deficient number, since it is larger than the sum of its proper divisors (536871).

52066981 is an equidigital number, since it uses as much as digits as its factorization.

52066981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536870.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 52066981 is about 7215.7453530457. The cubic root of 52066981 is about 373.4113080292.

The spelling of 52066981 in words is "fifty-two million, sixty-six thousand, nine hundred eighty-one".