53421631 has 4 divisors (see below), whose sum is σ = 53454600. Its totient is φ = 53388664.

The previous prime is 53421629. The next prime is 53421637. The reversal of 53421631 is 13612435.

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 53421631 - 2¹ = 53421629 is a prime.

It is a super-2 number, since 2×53421631² = 5707741317400322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 53421596 and 53421605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53421637) 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, 13921 + ... + 17338.

It is an arithmetic number, because the mean of its divisors is an integer number (13363650).

Almost surely, 2^53421631 is an apocalyptic number.

53421631 is a deficient number, since it is larger than the sum of its proper divisors (32969).

53421631 is a wasteful number, since it uses less digits than its factorization.

53421631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32968.

The product of its digits is 2160, while the sum is 25.

The square root of 53421631 is about 7309.0102613145. The cubic root of 53421631 is about 376.6220252348.

The spelling of 53421631 in words is "fifty-three million, four hundred twenty-one thousand, six hundred thirty-one".