30981317 has 4 divisors (see below), whose sum is σ = 31207596. Its totient is φ = 30755040.

The previous prime is 30981289. The next prime is 30981329. The reversal of 30981317 is 71318903.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18028516 + 12952801 = 4246^2 + 3599^2 .

It is a cyclic number.

It is not a de Polignac number, because 30981317 - 2¹⁴ = 30964933 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 (30981337) 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, 112934 + ... + 113207.

It is an arithmetic number, because the mean of its divisors is an integer number (7801899).

Almost surely, 2^30981317 is an apocalyptic number.

It is an amenable number.

30981317 is a deficient number, since it is larger than the sum of its proper divisors (226279).

30981317 is a wasteful number, since it uses less digits than its factorization.

30981317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226278.

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 30981317 is about 5566.0863270345. The cubic root of 30981317 is about 314.0749445841.

The spelling of 30981317 in words is "thirty million, nine hundred eighty-one thousand, three hundred seventeen".