191493243 has 6 divisors (see below), whose sum is σ = 276601364. Its totient is φ = 127662156.

The previous prime is 191493227. The next prime is 191493277. The reversal of 191493243 is 342394191.

It is not a de Polignac number, because 191493243 - 2⁴ = 191493227 is a prime.

It is a super-2 number, since 2×191493243² = 73339324229314098, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 191493198 and 191493207.

It is not an unprimeable number, because it can be changed into a prime (191493283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10638505 + ... + 10638522.

Almost surely, 2^191493243 is an apocalyptic number.

191493243 is a deficient number, since it is larger than the sum of its proper divisors (85108121).

191493243 is a wasteful number, since it uses less digits than its factorization.

191493243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21277033 (or 21277030 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 191493243 is about 13838.1083606106. The cubic root of 191493243 is about 576.3918322760.

The spelling of 191493243 in words is "one hundred ninety-one million, four hundred ninety-three thousand, two hundred forty-three".