30561385 has 4 divisors (see below), whose sum is σ = 36673668. Its totient is φ = 24449104.

The previous prime is 30561379. The next prime is 30561397. The reversal of 30561385 is 58316503.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58316503 = 7 ⋅8330929.

It can be written as a sum of positive squares in 2 ways, for example, as 10732176 + 19829209 = 3276^2 + 4453^2 .

It is a cyclic number.

It is not a de Polignac number, because 30561385 - 2⁵ = 30561353 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 an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3056134 + ... + 3056143.

It is an arithmetic number, because the mean of its divisors is an integer number (9168417).

Almost surely, 2^30561385 is an apocalyptic number.

It is an amenable number.

30561385 is a deficient number, since it is larger than the sum of its proper divisors (6112283).

30561385 is an equidigital number, since it uses as much as digits as its factorization.

30561385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6112282.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 30561385 is about 5528.2352518684. The cubic root of 30561385 is about 312.6494559766.

Adding to 30561385 its reverse (58316503), we get a palindrome (88877888).

The spelling of 30561385 in words is "thirty million, five hundred sixty-one thousand, three hundred eighty-five".