1830990121 has 4 divisors (see below), whose sum is σ = 1835068500. Its totient is φ = 1826911744.

The previous prime is 1830990113. The next prime is 1830990163. The reversal of 1830990121 is 1210990381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 986274025 + 844716096 = 31405^2 + 29064^2 .

It is a cyclic number.

It is not a de Polignac number, because 1830990121 - 2³ = 1830990113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1830990101) 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, 2038516 + ... + 2039413.

It is an arithmetic number, because the mean of its divisors is an integer number (458767125).

Almost surely, 2^1830990121 is an apocalyptic number.

It is an amenable number.

1830990121 is a deficient number, since it is larger than the sum of its proper divisors (4078379).

1830990121 is an equidigital number, since it uses as much as digits as its factorization.

1830990121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4078378.

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 1830990121 is about 42790.0703551653. The cubic root of 1830990121 is about 1223.3817579315.

The spelling of 1830990121 in words is "one billion, eight hundred thirty million, nine hundred ninety thousand, one hundred twenty-one".