30122881 has 4 divisors (see below), whose sum is σ = 30137092. Its totient is φ = 30108672.

The previous prime is 30122879. The next prime is 30122887. The reversal of 30122881 is 18822103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18822103 = 19 ⋅990637.

It can be written as a sum of positive squares in 2 ways, for example, as 14250625 + 15872256 = 3775^2 + 3984^2 .

It is a cyclic number.

It is not a de Polignac number, because 30122881 - 2¹ = 30122879 is a prime.

It is a super-2 number, since 2×30122881² = 1814775919480322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (30122887) 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, 3216 + ... + 8401.

It is an arithmetic number, because the mean of its divisors is an integer number (7534273).

Almost surely, 2^30122881 is an apocalyptic number.

It is an amenable number.

30122881 is a deficient number, since it is larger than the sum of its proper divisors (14211).

30122881 is a wasteful number, since it uses less digits than its factorization.

30122881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14210.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 30122881 is about 5488.4315610200. The cubic root of 30122881 is about 311.1469169343.

Adding to 30122881 its reverse (18822103), we get a palindrome (48944984).

The spelling of 30122881 in words is "thirty million, one hundred twenty-two thousand, eight hundred eighty-one".