191214869 has 2 divisors, whose sum is σ = 191214870. Its totient is φ = 191214868.

The previous prime is 191214769. The next prime is 191214899. The reversal of 191214869 is 968412191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 187333969 + 3880900 = 13687^2 + 1970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191214869 is a prime.

It is a super-2 number, since 2×191214869² = 73126252253374322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191214899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95607434 + 95607435.

It is an arithmetic number, because the mean of its divisors is an integer number (95607435).

Almost surely, 2^191214869 is an apocalyptic number.

It is an amenable number.

191214869 is a deficient number, since it is larger than the sum of its proper divisors (1).

191214869 is an equidigital number, since it uses as much as digits as its factorization.

191214869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 41.

The square root of 191214869 is about 13828.0464636188. The cubic root of 191214869 is about 576.1123962843.

The spelling of 191214869 in words is "one hundred ninety-one million, two hundred fourteen thousand, eight hundred sixty-nine".