30775561 has 4 divisors (see below), whose sum is σ = 30913792. Its totient is φ = 30637332.

The previous prime is 30775523. The next prime is 30775567. The reversal of 30775561 is 16557703.

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: 16557703 = 163 ⋅101581.

It is a cyclic number.

It is not a de Polignac number, because 30775561 - 2¹¹ = 30773513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30775567) 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, 68781 + ... + 69226.

It is an arithmetic number, because the mean of its divisors is an integer number (7728448).

Almost surely, 2^30775561 is an apocalyptic number.

It is an amenable number.

30775561 is a deficient number, since it is larger than the sum of its proper divisors (138231).

30775561 is a wasteful number, since it uses less digits than its factorization.

30775561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138230.

The product of its (nonzero) digits is 22050, while the sum is 34.

The square root of 30775561 is about 5547.5725321982. The cubic root of 30775561 is about 313.3781117786.

The spelling of 30775561 in words is "thirty million, seven hundred seventy-five thousand, five hundred sixty-one".