53591985 has 24 divisors (see below), whose sum is σ = 94872960. Its totient is φ = 27973152.

The previous prime is 53591983. The next prime is 53591987. The reversal of 53591985 is 58919535.

53591985 is a `hidden beast` number, since 53 + 591 + 9 + 8 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (53591983) and next prime (53591987).

It is not a de Polignac number, because 53591985 - 2¹ = 53591983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 53591985.

It is not an unprimeable number, because it can be changed into a prime (53591981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10555 + ... + 14784.

It is an arithmetic number, because the mean of its divisors is an integer number (3953040).

Almost surely, 2^53591985 is an apocalyptic number.

It is an amenable number.

53591985 is a deficient number, since it is larger than the sum of its proper divisors (41280975).

53591985 is a wasteful number, since it uses less digits than its factorization.

53591985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25397 (or 25394 counting only the distinct ones).

The product of its digits is 243000, while the sum is 45.

The square root of 53591985 is about 7320.6546838381. The cubic root of 53591985 is about 377.0219318506.

The spelling of 53591985 in words is "fifty-three million, five hundred ninety-one thousand, nine hundred eighty-five".