30981947 has 4 divisors (see below), whose sum is σ = 32050320. Its totient is φ = 29913576.

The previous prime is 30981917. The next prime is 30981949. The reversal of 30981947 is 74918903.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74918903 = 197 ⋅380299.

It is a cyclic number.

It is not a de Polignac number, because 30981947 - 2¹⁰ = 30980923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30981949) 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, 534143 + ... + 534200.

It is an arithmetic number, because the mean of its divisors is an integer number (8012580).

Almost surely, 2^30981947 is an apocalyptic number.

30981947 is a deficient number, since it is larger than the sum of its proper divisors (1068373).

30981947 is a wasteful number, since it uses less digits than its factorization.

30981947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068372.

The product of its (nonzero) digits is 54432, while the sum is 41.

The square root of 30981947 is about 5566.1429194731. The cubic root of 30981947 is about 314.0770734572.

The spelling of 30981947 in words is "thirty million, nine hundred eighty-one thousand, nine hundred forty-seven".