1812080121 has 8 divisors (see below), whose sum is σ = 2418762624. Its totient is φ = 1206725520.

The previous prime is 1812080119. The next prime is 1812080129. The reversal of 1812080121 is 1210802181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1812080121 - 2¹ = 1812080119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1812080091 and 1812080100.

It is not an unprimeable number, because it can be changed into a prime (1812080129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 328786 + ... + 334251.

It is an arithmetic number, because the mean of its divisors is an integer number (302345328).

Almost surely, 2^1812080121 is an apocalyptic number.

It is an amenable number.

1812080121 is a deficient number, since it is larger than the sum of its proper divisors (606682503).

1812080121 is an equidigital number, since it uses as much as digits as its factorization.

1812080121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 663951.

The product of its (nonzero) digits is 256, while the sum is 24.

The square root of 1812080121 is about 42568.5344004230. The cubic root of 1812080121 is about 1219.1555835974.

The spelling of 1812080121 in words is "one billion, eight hundred twelve million, eighty thousand, one hundred twenty-one".