30191139 has 12 divisors (see below), whose sum is σ = 47574072. Its totient is φ = 18297600.

The previous prime is 30191137. The next prime is 30191141. The reversal of 30191139 is 93119103.

It is an interprime number because it is at equal distance from previous prime (30191137) and next prime (30191141).

It is not a de Polignac number, because 30191139 - 2¹ = 30191137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30191137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 152382 + ... + 152579.

It is an arithmetic number, because the mean of its divisors is an integer number (3964506).

Almost surely, 2^30191139 is an apocalyptic number.

30191139 is a deficient number, since it is larger than the sum of its proper divisors (17382933).

30191139 is a wasteful number, since it uses less digits than its factorization.

30191139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304978 (or 304975 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 27.

The square root of 30191139 is about 5494.6463944461. The cubic root of 30191139 is about 311.3817577358.

The spelling of 30191139 in words is "thirty million, one hundred ninety-one thousand, one hundred thirty-nine".