1212153863 has 2 divisors, whose sum is σ = 1212153864. Its totient is φ = 1212153862.

The previous prime is 1212153857. The next prime is 1212153871. The reversal of 1212153863 is 3683512121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1212153863 - 2¹⁰ = 1212152839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212153463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606076931 + 606076932.

It is an arithmetic number, because the mean of its divisors is an integer number (606076932).

Almost surely, 2^1212153863 is an apocalyptic number.

1212153863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212153863 is an equidigital number, since it uses as much as digits as its factorization.

1212153863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8640, while the sum is 32.

The square root of 1212153863 is about 34816.0001005285. Note that the first 3 decimals coincide. The cubic root of 1212153863 is about 1066.2341377970.

Adding to 1212153863 its reverse (3683512121), we get a palindrome (4895665984).

The spelling of 1212153863 in words is "one billion, two hundred twelve million, one hundred fifty-three thousand, eight hundred sixty-three".