30865189 has 2 divisors, whose sum is σ = 30865190. Its totient is φ = 30865188.

The previous prime is 30865187. The next prime is 30865223. The reversal of 30865189 is 98156803.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27217089 + 3648100 = 5217^2 + 1910^2 .

It is a cyclic number.

It is not a de Polignac number, because 30865189 - 2¹ = 30865187 is a prime.

Together with 30865187, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30865187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15432594 + 15432595.

It is an arithmetic number, because the mean of its divisors is an integer number (15432595).

Almost surely, 2^30865189 is an apocalyptic number.

It is an amenable number.

30865189 is a deficient number, since it is larger than the sum of its proper divisors (1).

30865189 is an equidigital number, since it uses as much as digits as its factorization.

30865189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 30865189 is about 5555.6447870612. The cubic root of 30865189 is about 313.6820350872.

The spelling of 30865189 in words is "thirty million, eight hundred sixty-five thousand, one hundred eighty-nine".