31380317 has 4 divisors (see below), whose sum is σ = 33226236. Its totient is φ = 29534400.

The previous prime is 31380299. The next prime is 31380319. The reversal of 31380317 is 71308313.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71308313 = 89 ⋅801217.

It can be written as a sum of positive squares in 2 ways, for example, as 20016676 + 11363641 = 4474^2 + 3371^2 .

It is a cyclic number.

It is not a de Polignac number, because 31380317 - 2¹² = 31376221 is a prime.

It is a super-3 number, since 3×31380317³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31380319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922934 + ... + 922967.

It is an arithmetic number, because the mean of its divisors is an integer number (8306559).

Almost surely, 2^31380317 is an apocalyptic number.

It is an amenable number.

31380317 is a deficient number, since it is larger than the sum of its proper divisors (1845919).

31380317 is a wasteful number, since it uses less digits than its factorization.

31380317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845918.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 31380317 is about 5601.8137241433. The cubic root of 31380317 is about 315.4174929483.

The spelling of 31380317 in words is "thirty-one million, three hundred eighty thousand, three hundred seventeen".