31052561 has 4 divisors (see below), whose sum is σ = 31074624. Its totient is φ = 31030500.

The previous prime is 31052503. The next prime is 31052569. The reversal of 31052561 is 16525013.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31052561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31052569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8765 + ... + 11786.

It is an arithmetic number, because the mean of its divisors is an integer number (7768656).

Almost surely, 2^31052561 is an apocalyptic number.

It is an amenable number.

31052561 is a deficient number, since it is larger than the sum of its proper divisors (22063).

31052561 is a wasteful number, since it uses less digits than its factorization.

31052561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22062.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 31052561 is about 5572.4824809056. The cubic root of 31052561 is about 314.3155070439.

Adding to 31052561 its reverse (16525013), we get a palindrome (47577574).

It can be divided in two parts, 31052 and 561, that added together give a palindrome (31613).

The spelling of 31052561 in words is "thirty-one million, fifty-two thousand, five hundred sixty-one".