191862489023 has 4 divisors (see below), whose sum is σ = 196542061968. Its totient is φ = 187182916080.

The previous prime is 191862489017. The next prime is 191862489031. The reversal of 191862489023 is 320984268191.

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

It is a cyclic number.

It is not a de Polignac number, because 191862489023 - 2²⁰ = 191861440447 is a prime.

It is a super-2 number, since 2×191862489023² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191862489823) 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, 2339786411 + ... + 2339786492.

It is an arithmetic number, because the mean of its divisors is an integer number (49135515492).

Almost surely, 2^191862489023 is an apocalyptic number.

191862489023 is a deficient number, since it is larger than the sum of its proper divisors (4679572945).

191862489023 is an equidigital number, since it uses as much as digits as its factorization.

191862489023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4679572944.

The product of its (nonzero) digits is 1492992, while the sum is 53.

The spelling of 191862489023 in words is "one hundred ninety-one billion, eight hundred sixty-two million, four hundred eighty-nine thousand, twenty-three".