32531561 has 4 divisors (see below), whose sum is σ = 32989824. Its totient is φ = 32073300.

The previous prime is 32531549. The next prime is 32531563. The reversal of 32531561 is 16513523.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16513523 = 13 ⋅1270271.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-32531561 is a prime.

It is a super-2 number, since 2×32531561² = 2116604922193442, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 32531561.

It is not an unprimeable number, because it can be changed into a prime (32531563) 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, 229025 + ... + 229166.

It is an arithmetic number, because the mean of its divisors is an integer number (8247456).

Almost surely, 2^32531561 is an apocalyptic number.

It is an amenable number.

32531561 is a deficient number, since it is larger than the sum of its proper divisors (458263).

32531561 is an equidigital number, since it uses as much as digits as its factorization.

32531561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458262.

The product of its digits is 2700, while the sum is 26.

The square root of 32531561 is about 5703.6445366099. The cubic root of 32531561 is about 319.2284831724.

The spelling of 32531561 in words is "thirty-two million, five hundred thirty-one thousand, five hundred sixty-one".