1612111212 has 18 divisors (see below), whose sum is σ = 4075058988. Its totient is φ = 537370392.

The previous prime is 1612111181. The next prime is 1612111213. The reversal of 1612111212 is 2121112161.

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×1612111212² = 5197805119712217888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1612111213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22390398 + ... + 22390469.

It is an arithmetic number, because the mean of its divisors is an integer number (226392166).

Almost surely, 2^1612111212 is an apocalyptic number.

1612111212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1612111212 is an abundant number, since it is smaller than the sum of its proper divisors (2462947776).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1612111212 is a wasteful number, since it uses less digits than its factorization.

1612111212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44780877 (or 44780872 counting only the distinct ones).

The product of its digits is 48, while the sum is 18.

The square root of 1612111212 is about 40151.1047419620. The cubic root of 1612111212 is about 1172.5507968349.

Adding to 1612111212 its reverse (2121112161), we get a palindrome (3733223373).

The spelling of 1612111212 in words is "one billion, six hundred twelve million, one hundred eleven thousand, two hundred twelve".