53605591 has 4 divisors (see below), whose sum is σ = 57729112. Its totient is φ = 49482072.

The previous prime is 53605583. The next prime is 53605597. The reversal of 53605591 is 19550635.

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

It is a cyclic number.

It is not a de Polignac number, because 53605591 - 2³ = 53605583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53605597) 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, 2061741 + ... + 2061766.

It is an arithmetic number, because the mean of its divisors is an integer number (14432278).

Almost surely, 2^53605591 is an apocalyptic number.

53605591 is a deficient number, since it is larger than the sum of its proper divisors (4123521).

53605591 is a wasteful number, since it uses less digits than its factorization.

53605591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123520.

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 53605591 is about 7321.5839133346. The cubic root of 53605591 is about 377.0538354169.

The spelling of 53605591 in words is "fifty-three million, six hundred five thousand, five hundred ninety-one".