53639791 has 8 divisors (see below), whose sum is σ = 55820160. Its totient is φ = 51501912.

The previous prime is 53639783. The next prime is 53639797. The reversal of 53639791 is 19793635.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 53639791 - 2³ = 53639783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53639797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8035 + ... + 13108.

It is an arithmetic number, because the mean of its divisors is an integer number (6977520).

Almost surely, 2^53639791 is an apocalyptic number.

53639791 is a deficient number, since it is larger than the sum of its proper divisors (2180369).

53639791 is a wasteful number, since it uses less digits than its factorization.

53639791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21245.

The product of its digits is 153090, while the sum is 43.

The square root of 53639791 is about 7323.9191011370. The cubic root of 53639791 is about 377.1340042920.

The spelling of 53639791 in words is "fifty-three million, six hundred thirty-nine thousand, seven hundred ninety-one".