191423532011 has 4 divisors (see below), whose sum is σ = 192597909672. Its totient is φ = 190249154352.

The previous prime is 191423531983. The next prime is 191423532017. The reversal of 191423532011 is 110235324191.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-191423532011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (191423532017) 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, 587188586 + ... + 587188911.

It is an arithmetic number, because the mean of its divisors is an integer number (48149477418).

Almost surely, 2^191423532011 is an apocalyptic number.

191423532011 is a deficient number, since it is larger than the sum of its proper divisors (1174377661).

191423532011 is a wasteful number, since it uses less digits than its factorization.

191423532011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1174377660.

The product of its (nonzero) digits is 6480, while the sum is 32.

The spelling of 191423532011 in words is "one hundred ninety-one billion, four hundred twenty-three million, five hundred thirty-two thousand, eleven".