53389691 has 4 divisors (see below), whose sum is σ = 53407632. Its totient is φ = 53371752.

The previous prime is 53389663. The next prime is 53389717. The reversal of 53389691 is 19698335.

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 53389691 - 2¹⁰ = 53388667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53389591) 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, 3320 + ... + 10853.

It is an arithmetic number, because the mean of its divisors is an integer number (13351908).

Almost surely, 2^53389691 is an apocalyptic number.

53389691 is a deficient number, since it is larger than the sum of its proper divisors (17941).

53389691 is a wasteful number, since it uses less digits than its factorization.

53389691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17940.

The product of its digits is 174960, while the sum is 44.

The square root of 53389691 is about 7306.8249602683. The cubic root of 53389691 is about 376.5469513652.

The spelling of 53389691 in words is "fifty-three million, three hundred eighty-nine thousand, six hundred ninety-one".