191290234 has 4 divisors (see below), whose sum is σ = 286935354. Its totient is φ = 95645116.

The previous prime is 191290207. The next prime is 191290237. The reversal of 191290234 is 432092191.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 432092191 = 23 ⋅18786617.

It can be written as a sum of positive squares in only one way, i.e., 183467025 + 7823209 = 13545^2 + 2797^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191290196 and 191290205.

It is not an unprimeable number, because it can be changed into a prime (191290237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47822557 + ... + 47822560.

Almost surely, 2^191290234 is an apocalyptic number.

191290234 is a deficient number, since it is larger than the sum of its proper divisors (95645120).

191290234 is an equidigital number, since it uses as much as digits as its factorization.

191290234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95645119.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 191290234 is about 13830.7712727816. The cubic root of 191290234 is about 576.1880755588.

The spelling of 191290234 in words is "one hundred ninety-one million, two hundred ninety thousand, two hundred thirty-four".