52985781 has 12 divisors (see below), whose sum is σ = 76666720. Its totient is φ = 35263080.

The previous prime is 52985771. The next prime is 52985819. The reversal of 52985781 is 18758925.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-52985781 is a prime.

It is a super-2 number, since 2×52985781² = 5614985976359922, 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 (52985731) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 816 + ... + 10326.

Almost surely, 2^52985781 is an apocalyptic number.

It is an amenable number.

52985781 is a deficient number, since it is larger than the sum of its proper divisors (23680939).

52985781 is a wasteful number, since it uses less digits than its factorization.

52985781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10136 (or 10133 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 52985781 is about 7279.1332588434. The cubic root of 52985781 is about 375.5949808282.

The spelling of 52985781 in words is "fifty-two million, nine hundred eighty-five thousand, seven hundred eighty-one".