30990091 has 8 divisors (see below), whose sum is σ = 33998400. Its totient is φ = 28013640.

The previous prime is 30990077. The next prime is 30990097. The reversal of 30990091 is 19009903.

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

It is a cyclic number.

It is not a de Polignac number, because 30990091 - 2¹¹ = 30988043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30990097) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5901 + ... + 9838.

It is an arithmetic number, because the mean of its divisors is an integer number (4249800).

Almost surely, 2^30990091 is an apocalyptic number.

30990091 is a deficient number, since it is larger than the sum of its proper divisors (3008309).

30990091 is a wasteful number, since it uses less digits than its factorization.

30990091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15929.

The product of its (nonzero) digits is 2187, while the sum is 31.

The square root of 30990091 is about 5566.8744372403. The cubic root of 30990091 is about 314.1045907681.

Adding to 30990091 its reverse (19009903), we get a palindrome (49999994).

The spelling of 30990091 in words is "thirty million, nine hundred ninety thousand, ninety-one".