191321739148 has 6 divisors (see below), whose sum is σ = 334813043516. Its totient is φ = 95660869572.

The previous prime is 191321739143. The next prime is 191321739181. The reversal of 191321739148 is 841937123191.

It is not an unprimeable number, because it can be changed into a prime (191321739143) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23915217390 + ... + 23915217397.

Almost surely, 2^191321739148 is an apocalyptic number.

It is an amenable number.

191321739148 is a deficient number, since it is larger than the sum of its proper divisors (143491304368).

191321739148 is a wasteful number, since it uses less digits than its factorization.

191321739148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47830434791 (or 47830434789 counting only the distinct ones).

The product of its digits is 326592, while the sum is 49.

The spelling of 191321739148 in words is "one hundred ninety-one billion, three hundred twenty-one million, seven hundred thirty-nine thousand, one hundred forty-eight".