31142563 has 4 divisors (see below), whose sum is σ = 31160608. Its totient is φ = 31124520.

The previous prime is 31142557. The next prime is 31142591. The reversal of 31142563 is 36524113.

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 31142563 - 2²¹ = 29045411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31142543) 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, 6123 + ... + 9988.

It is an arithmetic number, because the mean of its divisors is an integer number (7790152).

Almost surely, 2^31142563 is an apocalyptic number.

31142563 is a deficient number, since it is larger than the sum of its proper divisors (18045).

31142563 is a wasteful number, since it uses less digits than its factorization.

31142563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18044.

The product of its digits is 2160, while the sum is 25.

The square root of 31142563 is about 5580.5522128191. The cubic root of 31142563 is about 314.6188823161.

Adding to 31142563 its reverse (36524113), we get a palindrome (67666676).

The spelling of 31142563 in words is "thirty-one million, one hundred forty-two thousand, five hundred sixty-three".