30872161 has 4 divisors (see below), whose sum is σ = 31378324. Its totient is φ = 30366000.

The previous prime is 30872147. The next prime is 30872197. The reversal of 30872161 is 16127803.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16127803 = 131 ⋅123113.

It can be written as a sum of positive squares in 2 ways, for example, as 1115136 + 29757025 = 1056^2 + 5455^2 .

It is a cyclic number.

It is not a de Polignac number, because 30872161 - 2⁷ = 30872033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30872111) 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, 252990 + ... + 253111.

It is an arithmetic number, because the mean of its divisors is an integer number (7844581).

Almost surely, 2^30872161 is an apocalyptic number.

It is an amenable number.

30872161 is a deficient number, since it is larger than the sum of its proper divisors (506163).

30872161 is an equidigital number, since it uses as much as digits as its factorization.

30872161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 506162.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 30872161 is about 5556.2722215529. The cubic root of 30872161 is about 313.7056520547.

Adding to 30872161 its reverse (16127803), we get a palindrome (46999964).

The spelling of 30872161 in words is "thirty million, eight hundred seventy-two thousand, one hundred sixty-one".