53172831 has 4 divisors (see below), whose sum is σ = 70897112. Its totient is φ = 35448552.

The previous prime is 53172829. The next prime is 53172841. The reversal of 53172831 is 13827135.

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

It is not a de Polignac number, because 53172831 - 2¹ = 53172829 is a prime.

It is a super-2 number, since 2×53172831² = 5654699913109122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53172841) 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, 8862136 + ... + 8862141.

It is an arithmetic number, because the mean of its divisors is an integer number (17724278).

Almost surely, 2^53172831 is an apocalyptic number.

53172831 is a deficient number, since it is larger than the sum of its proper divisors (17724281).

53172831 is a wasteful number, since it uses less digits than its factorization.

53172831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17724280.

The product of its digits is 5040, while the sum is 30.

The square root of 53172831 is about 7291.9703098682. The cubic root of 53172831 is about 376.0364359402.

Adding to 53172831 its reverse (13827135), we get a palindrome (66999966).

The spelling of 53172831 in words is "fifty-three million, one hundred seventy-two thousand, eight hundred thirty-one".