30981745 has 8 divisors (see below), whose sum is σ = 37213416. Its totient is φ = 24761856.

The previous prime is 30981737. The next prime is 30981749. The reversal of 30981745 is 54718903.

It can be written as a sum of positive squares in 4 ways, for example, as 2337841 + 28643904 = 1529^2 + 5352^2 .

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 30981745 - 2³ = 30981737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30981749) 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, 4609 + ... + 9121.

It is an arithmetic number, because the mean of its divisors is an integer number (4651677).

Almost surely, 2^30981745 is an apocalyptic number.

It is an amenable number.

30981745 is a deficient number, since it is larger than the sum of its proper divisors (6231671).

30981745 is a wasteful number, since it uses less digits than its factorization.

30981745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5891.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 30981745 is about 5566.1247740237. The cubic root of 30981745 is about 314.0763908693.

The spelling of 30981745 in words is "thirty million, nine hundred eighty-one thousand, seven hundred forty-five".