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30991091 is a prime number
BaseRepresentation
bin111011000111…
…0001011110011
32011022111210012
41312032023303
530413203331
63024125135
7524264015
oct166161363
964274705
1030991091
111654807a
12a4667ab
136561131
14418a1b5
152ac282b
hex1d8e2f3

30991091 has 2 divisors, whose sum is σ = 30991092. Its totient is φ = 30991090.

The previous prime is 30991067. The next prime is 30991123. The reversal of 30991091 is 19019903.

It is an a-pointer prime, because the next prime (30991123) can be obtained adding 30991091 to its sum of digits (32).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 30991091 - 214 = 30974707 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30991031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15495545 + 15495546.

It is an arithmetic number, because the mean of its divisors is an integer number (15495546).

Almost surely, 230991091 is an apocalyptic number.

30991091 is a deficient number, since it is larger than the sum of its proper divisors (1).

30991091 is an equidigital number, since it uses as much as digits as its factorization.

30991091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2187, while the sum is 32.

The square root of 30991091 is about 5566.9642535227. The cubic root of 30991091 is about 314.1079692804.

The spelling of 30991091 in words is "thirty million, nine hundred ninety-one thousand, ninety-one".