191482614521 has 4 divisors (see below), whose sum is σ = 208890124944. Its totient is φ = 174075104100.

The previous prime is 191482614503. The next prime is 191482614527. The reversal of 191482614521 is 125416284191.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 125416284191 = 11 ⋅11401480381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191482614521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (191482614527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8703755195 + ... + 8703755216.

It is an arithmetic number, because the mean of its divisors is an integer number (52222531236).

Almost surely, 2^191482614521 is an apocalyptic number.

191482614521 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

191482614521 is a deficient number, since it is larger than the sum of its proper divisors (17407510423).

191482614521 is a wasteful number, since it uses less digits than its factorization.

191482614521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17407510422.

The product of its digits is 138240, while the sum is 44.

The spelling of 191482614521 in words is "one hundred ninety-one billion, four hundred eighty-two million, six hundred fourteen thousand, five hundred twenty-one".