191321545156 has 24 divisors (see below), whose sum is σ = 382657432640. Its totient is φ = 81991874592.

The previous prime is 191321545141. The next prime is 191321545211. The reversal of 191321545156 is 651545123191.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734155 + ... + 960013.

Almost surely, 2^191321545156 is an apocalyptic number.

It is an amenable number.

191321545156 is an abundant number, since it is smaller than the sum of its proper divisors (191335887484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

191321545156 is a wasteful number, since it uses less digits than its factorization.

191321545156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256123 (or 256121 counting only the distinct ones).

The product of its digits is 162000, while the sum is 43.

The spelling of 191321545156 in words is "one hundred ninety-one billion, three hundred twenty-one million, five hundred forty-five thousand, one hundred fifty-six".