1209054121 has 4 divisors (see below), whose sum is σ = 1318968144. Its totient is φ = 1099140100.

The previous prime is 1209054107. The next prime is 1209054139. The reversal of 1209054121 is 1214509021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1214509021 = 11 ⋅110409911.

It is a cyclic number.

It is not a de Polignac number, because 1209054121 - 2⁵ = 1209054089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1209054191) 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, 54956995 + ... + 54957016.

It is an arithmetic number, because the mean of its divisors is an integer number (329742036).

Almost surely, 2^1209054121 is an apocalyptic number.

1209054121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1209054121 is a deficient number, since it is larger than the sum of its proper divisors (109914023).

1209054121 is a wasteful number, since it uses less digits than its factorization.

1209054121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109914022.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 1209054121 is about 34771.4555490563. The cubic root of 1209054121 is about 1065.3244975017.

The spelling of 1209054121 in words is "one billion, two hundred nine million, fifty-four thousand, one hundred twenty-one".