1212996391 has 2 divisors, whose sum is σ = 1212996392. Its totient is φ = 1212996390.

The previous prime is 1212996329. The next prime is 1212996401. The reversal of 1212996391 is 1936992121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1212996391 - 2¹⁷ = 1212865319 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212996091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606498195 + 606498196.

It is an arithmetic number, because the mean of its divisors is an integer number (606498196).

Almost surely, 2^1212996391 is an apocalyptic number.

1212996391 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212996391 is an equidigital number, since it uses as much as digits as its factorization.

1212996391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 43.

The square root of 1212996391 is about 34828.0977229593. The cubic root of 1212996391 is about 1066.4811152613.

The spelling of 1212996391 in words is "one billion, two hundred twelve million, nine hundred ninety-six thousand, three hundred ninety-one".