53172581 has 8 divisors (see below), whose sum is σ = 66293184. Its totient is φ = 41433120.

The previous prime is 53172571. The next prime is 53172599. The reversal of 53172581 is 18527135.

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 53172581 - 2⁶ = 53172517 is a prime.

It is a super-2 number, since 2×53172581² = 5654646740403122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53172571) 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, 345200 + ... + 345353.

It is an arithmetic number, because the mean of its divisors is an integer number (8286648).

Almost surely, 2^53172581 is an apocalyptic number.

It is an amenable number.

53172581 is a deficient number, since it is larger than the sum of its proper divisors (13120603).

53172581 is a wasteful number, since it uses less digits than its factorization.

53172581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690571.

The product of its digits is 8400, while the sum is 32.

The square root of 53172581 is about 7291.9531677048. The cubic root of 53172581 is about 376.0358466088.

The spelling of 53172581 in words is "fifty-three million, one hundred seventy-two thousand, five hundred eighty-one".