191457202994 has 4 divisors (see below), whose sum is σ = 287185804494. Its totient is φ = 95728601496.

The previous prime is 191457202973. The next prime is 191457202997. The reversal of 191457202994 is 499202754191.

191457202994 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 499202754191 = 17747 ⋅28128853.

It can be written as a sum of positive squares in only one way, i.e., 102422401225 + 89034801769 = 320035^2 + 298387^2 .

It is not an unprimeable number, because it can be changed into a prime (191457202997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47864300747 + ... + 47864300750.

Almost surely, 2^191457202994 is an apocalyptic number.

191457202994 is a deficient number, since it is larger than the sum of its proper divisors (95728601500).

191457202994 is an equidigital number, since it uses as much as digits as its factorization.

191457202994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95728601499.

The product of its (nonzero) digits is 1632960, while the sum is 53.

The spelling of 191457202994 in words is "one hundred ninety-one billion, four hundred fifty-seven million, two hundred two thousand, nine hundred ninety-four".