53572391 has 4 divisors (see below), whose sum is σ = 53882232. Its totient is φ = 53262552.

The previous prime is 53572357. The next prime is 53572399. The reversal of 53572391 is 19327535.

It is a happy number.

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 53572391 - 2¹⁰ = 53571367 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 (53572399) 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, 154661 + ... + 155006.

It is an arithmetic number, because the mean of its divisors is an integer number (13470558).

Almost surely, 2^53572391 is an apocalyptic number.

53572391 is a deficient number, since it is larger than the sum of its proper divisors (309841).

53572391 is a wasteful number, since it uses less digits than its factorization.

53572391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309840.

The product of its digits is 28350, while the sum is 35.

The square root of 53572391 is about 7319.3162932066. The cubic root of 53572391 is about 376.9759780372.

The spelling of 53572391 in words is "fifty-three million, five hundred seventy-two thousand, three hundred ninety-one".