31123713 has 4 divisors (see below), whose sum is σ = 41498288. Its totient is φ = 20749140.

The previous prime is 31123681. The next prime is 31123723. The reversal of 31123713 is 31732113.

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 not a de Polignac number, because 31123713 - 2⁵ = 31123681 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31123713.

It is not an unprimeable number, because it can be changed into a prime (31123723) 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, 5187283 + ... + 5187288.

It is an arithmetic number, because the mean of its divisors is an integer number (10374572).

Almost surely, 2^31123713 is an apocalyptic number.

It is an amenable number.

31123713 is a deficient number, since it is larger than the sum of its proper divisors (10374575).

31123713 is a wasteful number, since it uses less digits than its factorization.

31123713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10374574.

The product of its digits is 378, while the sum is 21.

The square root of 31123713 is about 5578.8630562149. The cubic root of 31123713 is about 314.5553918996. Note that the first 3 decimals are identical.

Adding to 31123713 its reverse (31732113), we get a palindrome (62855826).

Subtracting 31123713 from its reverse (31732113), we obtain a square (608400 = 780²).

The spelling of 31123713 in words is "thirty-one million, one hundred twenty-three thousand, seven hundred thirteen".