1211979233 has 2 divisors, whose sum is σ = 1211979234. Its totient is φ = 1211979232.

The previous prime is 1211979221. The next prime is 1211979313. The reversal of 1211979233 is 3329791121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1004129344 + 207849889 = 31688^2 + 14417^2 .

It is a cyclic number.

It is not a de Polignac number, because 1211979233 - 2⁴ = 1211979217 is a prime.

It is a super-2 number, since 2×1211979233² = 2937787322446536578, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1211979203) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605989616 + 605989617.

It is an arithmetic number, because the mean of its divisors is an integer number (605989617).

Almost surely, 2^1211979233 is an apocalyptic number.

It is an amenable number.

1211979233 is a deficient number, since it is larger than the sum of its proper divisors (1).

1211979233 is an equidigital number, since it uses as much as digits as its factorization.

1211979233 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 38.

The square root of 1211979233 is about 34813.4921115363. The cubic root of 1211979233 is about 1066.1829326886.

The spelling of 1211979233 in words is "one billion, two hundred eleven million, nine hundred seventy-nine thousand, two hundred thirty-three".