31242543 has 4 divisors (see below), whose sum is σ = 41656728. Its totient is φ = 20828360.

The previous prime is 31242539. The next prime is 31242551. The reversal of 31242543 is 34524213.

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 31242543 - 2² = 31242539 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31242503) 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, 5207088 + ... + 5207093.

It is an arithmetic number, because the mean of its divisors is an integer number (10414182).

Almost surely, 2^31242543 is an apocalyptic number.

31242543 is a deficient number, since it is larger than the sum of its proper divisors (10414185).

31242543 is a wasteful number, since it uses less digits than its factorization.

31242543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10414184.

The product of its digits is 2880, while the sum is 24.

The square root of 31242543 is about 5589.5029295994. The cubic root of 31242543 is about 314.9552065306.

Adding to 31242543 its reverse (34524213), we get a palindrome (65766756).

The spelling of 31242543 in words is "thirty-one million, two hundred forty-two thousand, five hundred forty-three".