30921249 has 8 divisors (see below), whose sum is σ = 43653600. Its totient is φ = 19401536.

The previous prime is 30921239. The next prime is 30921271. The reversal of 30921249 is 94212903.

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 30921249 - 2¹¹ = 30919201 is a prime.

It is a super-2 number, since 2×30921249² = 1912247279440002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30921239) 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 7 ways as a sum of consecutive naturals, for example, 303099 + ... + 303200.

It is an arithmetic number, because the mean of its divisors is an integer number (5456700).

Almost surely, 2^30921249 is an apocalyptic number.

It is an amenable number.

30921249 is a deficient number, since it is larger than the sum of its proper divisors (12732351).

30921249 is a wasteful number, since it uses less digits than its factorization.

30921249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606319.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 30921249 is about 5560.6878171679. The cubic root of 30921249 is about 313.8718322850.

The spelling of 30921249 in words is "thirty million, nine hundred twenty-one thousand, two hundred forty-nine".