53161531 has 4 divisors (see below), whose sum is σ = 53195272. Its totient is φ = 53127792.

The previous prime is 53161517. The next prime is 53161541. The reversal of 53161531 is 13516135.

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 53161531 - 2⁹ = 53161019 is a prime.

It is a super-2 number, since 2×53161531² = 5652296756527922, 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 = 53161496 and 53161505.

It is not an unprimeable number, because it can be changed into a prime (53161541) 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, 14385 + ... + 17698.

It is an arithmetic number, because the mean of its divisors is an integer number (13298818).

Almost surely, 2^53161531 is an apocalyptic number.

53161531 is a deficient number, since it is larger than the sum of its proper divisors (33741).

53161531 is a wasteful number, since it uses less digits than its factorization.

53161531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33740.

The product of its digits is 1350, while the sum is 25.

The square root of 53161531 is about 7291.1954438213. The cubic root of 53161531 is about 376.0097963156.

Adding to 53161531 its reverse (13516135), we get a palindrome (66677666).

The spelling of 53161531 in words is "fifty-three million, one hundred sixty-one thousand, five hundred thirty-one".