30664561 has 4 divisors (see below), whose sum is σ = 31052800. Its totient is φ = 30276324.

The previous prime is 30664559. The next prime is 30664567. The reversal of 30664561 is 16546603.

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.

It is a cyclic number.

It is not a de Polignac number, because 30664561 - 2¹ = 30664559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30664567) 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, 194001 + ... + 194158.

It is an arithmetic number, because the mean of its divisors is an integer number (7763200).

Almost surely, 2^30664561 is an apocalyptic number.

It is an amenable number.

30664561 is a deficient number, since it is larger than the sum of its proper divisors (388239).

30664561 is an equidigital number, since it uses as much as digits as its factorization.

30664561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388238.

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 30664561 is about 5537.5591193232. The cubic root of 30664561 is about 313.0008982407. Note that the first 3 decimals are identical.

The spelling of 30664561 in words is "thirty million, six hundred sixty-four thousand, five hundred sixty-one".