1212120089 has 4 divisors (see below), whose sum is σ = 1224121380. Its totient is φ = 1200118800.

The previous prime is 1212120071. The next prime is 1212120097. The reversal of 1212120089 is 9800212121.

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 991746064 + 220374025 = 31492^2 + 14845^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212120089 - 2¹⁶ = 1212054553 is a prime.

It is a super-2 number, since 2×1212120089² = 2938470220314735842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212120389) 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, 6000494 + ... + 6000695.

It is an arithmetic number, because the mean of its divisors is an integer number (306030345).

Almost surely, 2^1212120089 is an apocalyptic number.

It is an amenable number.

1212120089 is a deficient number, since it is larger than the sum of its proper divisors (12001291).

1212120089 is a wasteful number, since it uses less digits than its factorization.

1212120089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12001290.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1212120089 is about 34815.5150615354. The cubic root of 1212120089 is about 1066.2242349490.

The spelling of 1212120089 in words is "one billion, two hundred twelve million, one hundred twenty thousand, eighty-nine".