191240143 has 2 divisors, whose sum is σ = 191240144. Its totient is φ = 191240142.

The previous prime is 191240099. The next prime is 191240171. The reversal of 191240143 is 341042191.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 191240143 - 2²¹ = 189142991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191240243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95620071 + 95620072.

It is an arithmetic number, because the mean of its divisors is an integer number (95620072).

Almost surely, 2^191240143 is an apocalyptic number.

191240143 is a deficient number, since it is larger than the sum of its proper divisors (1).

191240143 is an equidigital number, since it uses as much as digits as its factorization.

191240143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 191240143 is about 13828.9603007601. The cubic root of 191240143 is about 576.1377778935.

The spelling of 191240143 in words is "one hundred ninety-one million, two hundred forty thousand, one hundred forty-three".