30542521 has 4 divisors (see below), whose sum is σ = 30613492. Its totient is φ = 30471552.

The previous prime is 30542507. The next prime is 30542531. The reversal of 30542521 is 12524503.

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 17139600 + 13402921 = 4140^2 + 3661^2 .

It is a cyclic number.

It is not a de Polignac number, because 30542521 - 2¹¹ = 30540473 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30542492 and 30542501.

It is not an unprimeable number, because it can be changed into a prime (30542531) 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, 34836 + ... + 35701.

It is an arithmetic number, because the mean of its divisors is an integer number (7653373).

Almost surely, 2^30542521 is an apocalyptic number.

It is an amenable number.

30542521 is a deficient number, since it is larger than the sum of its proper divisors (70971).

30542521 is an equidigital number, since it uses as much as digits as its factorization.

30542521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70970.

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 30542521 is about 5526.5288382492. The cubic root of 30542521 is about 312.5851151619.

The spelling of 30542521 in words is "thirty million, five hundred forty-two thousand, five hundred twenty-one".