31481243 has 4 divisors (see below), whose sum is σ = 31508208. Its totient is φ = 31454280.

The previous prime is 31481239. The next prime is 31481249. The reversal of 31481243 is 34218413.

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 31481243 - 2² = 31481239 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31481249) 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, 11648 + ... + 14093.

It is an arithmetic number, because the mean of its divisors is an integer number (7877052).

Almost surely, 2^31481243 is an apocalyptic number.

31481243 is a deficient number, since it is larger than the sum of its proper divisors (26965).

31481243 is a wasteful number, since it uses less digits than its factorization.

31481243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26964.

The product of its digits is 2304, while the sum is 26.

The square root of 31481243 is about 5610.8148249608. The cubic root of 31481243 is about 315.7552817449.

Adding to 31481243 its reverse (34218413), we get a palindrome (65699656).

The spelling of 31481243 in words is "thirty-one million, four hundred eighty-one thousand, two hundred forty-three".