30790121 has 4 divisors (see below), whose sum is σ = 30802644. Its totient is φ = 30777600.

The previous prime is 30790093. The next prime is 30790147. The reversal of 30790121 is 12109703.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12109703 = 43 ⋅281621.

It can be written as a sum of positive squares in 2 ways, for example, as 16810000 + 13980121 = 4100^2 + 3739^2 .

It is a cyclic number.

It is not a de Polignac number, because 30790121 - 2¹⁸ = 30527977 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (30790181) 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, 1220 + ... + 7941.

It is an arithmetic number, because the mean of its divisors is an integer number (7700661).

Almost surely, 2^30790121 is an apocalyptic number.

It is an amenable number.

30790121 is a deficient number, since it is larger than the sum of its proper divisors (12523).

30790121 is an equidigital number, since it uses as much as digits as its factorization.

30790121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12522.

The product of its (nonzero) digits is 378, while the sum is 23.

The square root of 30790121 is about 5548.8846627047. The cubic root of 30790121 is about 313.4275239939.

Adding to 30790121 its reverse (12109703), we get a palindrome (42899824).

The spelling of 30790121 in words is "thirty million, seven hundred ninety thousand, one hundred twenty-one".