191218967 has 2 divisors, whose sum is σ = 191218968. Its totient is φ = 191218966.

The previous prime is 191218949. The next prime is 191218981. The reversal of 191218967 is 769812191.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191218967 - 2¹⁸ = 190956823 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191218927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95609483 + 95609484.

It is an arithmetic number, because the mean of its divisors is an integer number (95609484).

Almost surely, 2^191218967 is an apocalyptic number.

191218967 is a deficient number, since it is larger than the sum of its proper divisors (1).

191218967 is an equidigital number, since it uses as much as digits as its factorization.

191218967 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 44.

The square root of 191218967 is about 13828.1946399376. The cubic root of 191218967 is about 576.1165118843.

The spelling of 191218967 in words is "one hundred ninety-one million, two hundred eighteen thousand, nine hundred sixty-seven".