31318741 has 4 divisors (see below), whose sum is σ = 31596012. Its totient is φ = 31041472.

The previous prime is 31318723. The next prime is 31318747. The reversal of 31318741 is 14781313.

31318741 = 254² + 255² + ... + 479².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14781313 = 17 ⋅869489.

It can be written as a sum of positive squares in 2 ways, for example, as 5522500 + 25796241 = 2350^2 + 5079^2 .

It is a cyclic number.

It is not a de Polignac number, because 31318741 - 2¹⁷ = 31187669 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 (31318747) 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, 138466 + ... + 138691.

It is an arithmetic number, because the mean of its divisors is an integer number (7899003).

Almost surely, 2^31318741 is an apocalyptic number.

It is an amenable number.

31318741 is a deficient number, since it is larger than the sum of its proper divisors (277271).

31318741 is a wasteful number, since it uses less digits than its factorization.

31318741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277270.

The product of its digits is 2016, while the sum is 28.

The square root of 31318741 is about 5596.3149482494. The cubic root of 31318741 is about 315.2110486230.

The spelling of 31318741 in words is "thirty-one million, three hundred eighteen thousand, seven hundred forty-one".