1214167991 has 2 divisors, whose sum is σ = 1214167992. Its totient is φ = 1214167990.

The previous prime is 1214167961. The next prime is 1214168009. The reversal of 1214167991 is 1997614121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1214167991 - 2¹⁴ = 1214151607 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1214167951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 607083995 + 607083996.

It is an arithmetic number, because the mean of its divisors is an integer number (607083996).

Almost surely, 2^1214167991 is an apocalyptic number.

1214167991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1214167991 is an equidigital number, since it uses as much as digits as its factorization.

1214167991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 41.

The square root of 1214167991 is about 34844.9134164515. The cubic root of 1214167991 is about 1066.8243664084.

The spelling of 1214167991 in words is "one billion, two hundred fourteen million, one hundred sixty-seven thousand, nine hundred ninety-one".