31125563 has 4 divisors (see below), whose sum is σ = 35572080. Its totient is φ = 26679048.

The previous prime is 31125529. The next prime is 31125571. The reversal of 31125563 is 36552113.

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 31125563 - 2⁶ = 31125499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31125503) 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, 2223248 + ... + 2223261.

It is an arithmetic number, because the mean of its divisors is an integer number (8893020).

Almost surely, 2^31125563 is an apocalyptic number.

31125563 is a deficient number, since it is larger than the sum of its proper divisors (4446517).

31125563 is an equidigital number, since it uses as much as digits as its factorization.

31125563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4446516.

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

The square root of 31125563 is about 5579.0288581437. The cubic root of 31125563 is about 314.5616241889.

Adding to 31125563 its reverse (36552113), we get a palindrome (67677676).

The spelling of 31125563 in words is "thirty-one million, one hundred twenty-five thousand, five hundred sixty-three".