191345873 has 2 divisors, whose sum is σ = 191345874. Its totient is φ = 191345872.

The previous prime is 191345867. The next prime is 191345879. The reversal of 191345873 is 378543191.

It is a balanced prime because it is at equal distance from previous prime (191345867) and next prime (191345879).

It can be written as a sum of positive squares in only one way, i.e., 162001984 + 29343889 = 12728^2 + 5417^2 .

It is a cyclic number.

It is not a de Polignac number, because 191345873 - 2⁸ = 191345617 is a prime.

It is a super-2 number, since 2×191345873² = 73226486228264258, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191345873.

It is not a weakly prime, because it can be changed into another prime (191345879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 95672936 + 95672937.

It is an arithmetic number, because the mean of its divisors is an integer number (95672937).

Almost surely, 2^191345873 is an apocalyptic number.

It is an amenable number.

191345873 is a deficient number, since it is larger than the sum of its proper divisors (1).

191345873 is an equidigital number, since it uses as much as digits as its factorization.

191345873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 191345873 is about 13832.7825472679. The cubic root of 191345873 is about 576.2439338219.

The spelling of 191345873 in words is "one hundred ninety-one million, three hundred forty-five thousand, eight hundred seventy-three".