30113561 has 4 divisors (see below), whose sum is σ = 30178512. Its totient is φ = 30048612.

The previous prime is 30113543. The next prime is 30113563. The reversal of 30113561 is 16531103.

It is a happy number.

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: 16531103 = 149 ⋅110947.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30113561 is a prime.

It is a super-3 number, since 3×30113561³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30113563) 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, 31775 + ... + 32708.

It is an arithmetic number, because the mean of its divisors is an integer number (7544628).

Almost surely, 2^30113561 is an apocalyptic number.

It is an amenable number.

30113561 is a deficient number, since it is larger than the sum of its proper divisors (64951).

30113561 is an equidigital number, since it uses as much as digits as its factorization.

30113561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64950.

The product of its (nonzero) digits is 270, while the sum is 20.

The square root of 30113561 is about 5487.5824367384. The cubic root of 30113561 is about 311.1148240723.

Adding to 30113561 its reverse (16531103), we get a palindrome (46644664).

The spelling of 30113561 in words is "thirty million, one hundred thirteen thousand, five hundred sixty-one".