1229815231 has 2 divisors, whose sum is σ = 1229815232. Its totient is φ = 1229815230.

The previous prime is 1229815201. The next prime is 1229815243. The reversal of 1229815231 is 1325189221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1229815231 - 2¹⁹ = 1229290943 is a prime.

It is a super-2 number, since 2×1229815231² = 3024891004799166722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1229815201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614907615 + 614907616.

It is an arithmetic number, because the mean of its divisors is an integer number (614907616).

Almost surely, 2^1229815231 is an apocalyptic number.

1229815231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1229815231 is an equidigital number, since it uses as much as digits as its factorization.

1229815231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 34.

The square root of 1229815231 is about 35068.7215478409. The cubic root of 1229815231 is about 1071.3876168329.

The spelling of 1229815231 in words is "one billion, two hundred twenty-nine million, eight hundred fifteen thousand, two hundred thirty-one".