53611531 has 4 divisors (see below), whose sum is σ = 53651952. Its totient is φ = 53571112.

The previous prime is 53611511. The next prime is 53611561. The reversal of 53611531 is 13511635.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13511635 = 5 ⋅2702327.

It is a cyclic number.

It is not a de Polignac number, because 53611531 - 2⁵ = 53611499 is a prime.

It is a super-2 number, since 2×53611531² = 5748392512327922, 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 = 53611496 and 53611505.

It is not an unprimeable number, because it can be changed into a prime (53611501) 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, 18151 + ... + 20896.

It is an arithmetic number, because the mean of its divisors is an integer number (13412988).

Almost surely, 2^53611531 is an apocalyptic number.

53611531 is a deficient number, since it is larger than the sum of its proper divisors (40421).

53611531 is a wasteful number, since it uses less digits than its factorization.

53611531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40420.

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

The square root of 53611531 is about 7321.9895520275. The cubic root of 53611531 is about 377.0677619311.

The spelling of 53611531 in words is "fifty-three million, six hundred eleven thousand, five hundred thirty-one".