30971139 has 8 divisors (see below), whose sum is σ = 42627072. Its totient is φ = 19981320.

The previous prime is 30971131. The next prime is 30971147. The reversal of 30971139 is 93117903.

It is an interprime number because it is at equal distance from previous prime (30971131) and next prime (30971147).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 30971139 - 2³ = 30971131 is a prime.

It is a super-2 number, since 2×30971139² = 1918422901914642, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30971131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166419 + ... + 166604.

It is an arithmetic number, because the mean of its divisors is an integer number (5328384).

Almost surely, 2^30971139 is an apocalyptic number.

30971139 is a deficient number, since it is larger than the sum of its proper divisors (11655933).

30971139 is a wasteful number, since it uses less digits than its factorization.

30971139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333057.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 30971139 is about 5565.1719649980. The cubic root of 30971139 is about 314.0405474569.

The spelling of 30971139 in words is "thirty million, nine hundred seventy-one thousand, one hundred thirty-nine".