30749521 has 4 divisors (see below), whose sum is σ = 33544944. Its totient is φ = 27954100.

The previous prime is 30749519. The next prime is 30749527. The reversal of 30749521 is 12594703.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12594703 = 11 ⋅1144973.

It is a cyclic number.

It is not a de Polignac number, because 30749521 - 2¹ = 30749519 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30749527) 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 3 ways as a sum of consecutive naturals, for example, 1397695 + ... + 1397716.

It is an arithmetic number, because the mean of its divisors is an integer number (8386236).

Almost surely, 2^30749521 is an apocalyptic number.

It is an amenable number.

30749521 is a deficient number, since it is larger than the sum of its proper divisors (2795423).

30749521 is a wasteful number, since it uses less digits than its factorization.

30749521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2795422.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 30749521 is about 5545.2250630610. The cubic root of 30749521 is about 313.2897010568.

The spelling of 30749521 in words is "thirty million, seven hundred forty-nine thousand, five hundred twenty-one".