30133391 has 4 divisors (see below), whose sum is σ = 30149400. Its totient is φ = 30117384.

The previous prime is 30133387. The next prime is 30133403. The reversal of 30133391 is 19333103.

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 30133391 - 2² = 30133387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30133361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4736 + ... + 9093.

It is an arithmetic number, because the mean of its divisors is an integer number (7537350).

Almost surely, 2^30133391 is an apocalyptic number.

30133391 is a deficient number, since it is larger than the sum of its proper divisors (16009).

30133391 is a wasteful number, since it uses less digits than its factorization.

30133391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16008.

The product of its (nonzero) digits is 729, while the sum is 23.

The square root of 30133391 is about 5489.3889459575. The cubic root of 30133391 is about 311.1830995496.

Adding to 30133391 its reverse (19333103), we get a palindrome (49466494).

The spelling of 30133391 in words is "thirty million, one hundred thirty-three thousand, three hundred ninety-one".