31243913 has 8 divisors (see below), whose sum is σ = 32788800. Its totient is φ = 29714608.

The previous prime is 31243907. The next prime is 31243921. The reversal of 31243913 is 31934213.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31243913 - 2⁴ = 31243897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31243903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 323 + ... + 7911.

It is an arithmetic number, because the mean of its divisors is an integer number (4098600).

Almost surely, 2^31243913 is an apocalyptic number.

It is an amenable number.

31243913 is a deficient number, since it is larger than the sum of its proper divisors (1544887).

31243913 is a wasteful number, since it uses less digits than its factorization.

31243913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7791.

The product of its digits is 1944, while the sum is 26.

The square root of 31243913 is about 5589.6254794038. The cubic root of 31243913 is about 314.9598101072.

The spelling of 31243913 in words is "thirty-one million, two hundred forty-three thousand, nine hundred thirteen".