30921049 has 4 divisors (see below), whose sum is σ = 31227300. Its totient is φ = 30614800.

The previous prime is 30921019. The next prime is 30921053. The reversal of 30921049 is 94012903.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21557449 + 9363600 = 4643^2 + 3060^2 .

It is a cyclic number.

It is not a de Polignac number, because 30921049 - 2⁵ = 30921017 is a prime.

It is a super-2 number, since 2×30921049² = 1912222542520802, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30921019) 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, 152974 + ... + 153175.

It is an arithmetic number, because the mean of its divisors is an integer number (7806825).

Almost surely, 2^30921049 is an apocalyptic number.

It is an amenable number.

30921049 is a deficient number, since it is larger than the sum of its proper divisors (306251).

30921049 is a wasteful number, since it uses less digits than its factorization.

30921049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306250.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 30921049 is about 5560.6698337520. The cubic root of 30921049 is about 313.8711555712.

The spelling of 30921049 in words is "thirty million, nine hundred twenty-one thousand, forty-nine".