30123091 has 4 divisors (see below), whose sum is σ = 30823672. Its totient is φ = 29422512.

The previous prime is 30123089. The next prime is 30123097. The reversal of 30123091 is 19032103.

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 30123091 - 2¹ = 30123089 is a prime.

It is a super-2 number, since 2×30123091² = 1814801222788562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30123097) 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 3 ways as a sum of consecutive naturals, for example, 350226 + ... + 350311.

It is an arithmetic number, because the mean of its divisors is an integer number (7705918).

Almost surely, 2^30123091 is an apocalyptic number.

30123091 is a deficient number, since it is larger than the sum of its proper divisors (700581).

30123091 is an equidigital number, since it uses as much as digits as its factorization.

30123091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700580.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 30123091 is about 5488.4506921353. The cubic root of 30123091 is about 311.1476399805.

Adding to 30123091 its reverse (19032103), we get a palindrome (49155194).

The spelling of 30123091 in words is "thirty million, one hundred twenty-three thousand, ninety-one".