30981371 has 4 divisors (see below), whose sum is σ = 31701912. Its totient is φ = 30260832.

The previous prime is 30981337. The next prime is 30981373. The reversal of 30981371 is 17318903.

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

It is a cyclic number.

It is not a de Polignac number, because 30981371 - 2¹⁴ = 30964987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30981373) 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, 360206 + ... + 360291.

It is an arithmetic number, because the mean of its divisors is an integer number (7925478).

Almost surely, 2^30981371 is an apocalyptic number.

30981371 is a deficient number, since it is larger than the sum of its proper divisors (720541).

30981371 is an equidigital number, since it uses as much as digits as its factorization.

30981371 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720540.

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

The square root of 30981371 is about 5566.0911778375. The cubic root of 30981371 is about 314.0751270601.

The spelling of 30981371 in words is "thirty million, nine hundred eighty-one thousand, three hundred seventy-one".