1212151231 has 2 divisors, whose sum is σ = 1212151232. Its totient is φ = 1212151230.

The previous prime is 1212151223. The next prime is 1212151247. The reversal of 1212151231 is 1321512121.

It is a weak prime.

It is an emirp because it is prime and its reverse (1321512121) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1212151231 - 2³ = 1212151223 is a prime.

It is a super-2 number, since 2×1212151231² = 2938621213629630722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1212151199 and 1212151208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212151261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606075615 + 606075616.

It is an arithmetic number, because the mean of its divisors is an integer number (606075616).

Almost surely, 2^1212151231 is an apocalyptic number.

1212151231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212151231 is an equidigital number, since it uses as much as digits as its factorization.

1212151231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 120, while the sum is 19.

The square root of 1212151231 is about 34815.9623017948. The cubic root of 1212151231 is about 1066.2333660769.

Adding to 1212151231 its reverse (1321512121), we get a palindrome (2533663352).

The spelling of 1212151231 in words is "one billion, two hundred twelve million, one hundred fifty-one thousand, two hundred thirty-one".