31243541 has 4 divisors (see below), whose sum is σ = 35706912. Its totient is φ = 26780172.

The previous prime is 31243523. The next prime is 31243571. The reversal of 31243541 is 14534213.

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-31243541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31243571) 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, 2231675 + ... + 2231688.

It is an arithmetic number, because the mean of its divisors is an integer number (8926728).

Almost surely, 2^31243541 is an apocalyptic number.

It is an amenable number.

31243541 is a deficient number, since it is larger than the sum of its proper divisors (4463371).

31243541 is an equidigital number, since it uses as much as digits as its factorization.

31243541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4463370.

The product of its digits is 1440, while the sum is 23.

The square root of 31243541 is about 5589.5922033723. The cubic root of 31243541 is about 314.9585600983.

Adding to 31243541 its reverse (14534213), we get a palindrome (45777754).

The spelling of 31243541 in words is "thirty-one million, two hundred forty-three thousand, five hundred forty-one".