31240047 has 16 divisors (see below), whose sum is σ = 45360000. Its totient is φ = 19049184.

The previous prime is 31240043. The next prime is 31240061. The reversal of 31240047 is 74004213.

It is not a de Polignac number, because 31240047 - 2² = 31240043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31240043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7797 + ... + 11102.

It is an arithmetic number, because the mean of its divisors is an integer number (2835000).

Almost surely, 2^31240047 is an apocalyptic number.

31240047 is a deficient number, since it is larger than the sum of its proper divisors (14119953).

31240047 is a wasteful number, since it uses less digits than its factorization.

31240047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18950.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 31240047 is about 5589.2796494718. The cubic root of 31240047 is about 314.9468189384.

The spelling of 31240047 in words is "thirty-one million, two hundred forty thousand, forty-seven".