191423853 has 24 divisors (see below), whose sum is σ = 287089920. Its totient is φ = 122777280.

The previous prime is 191423851. The next prime is 191423857. The reversal of 191423853 is 358324191.

It is not a de Polignac number, because 191423853 - 2¹ = 191423851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191423851) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48025 + ... + 51857.

It is an arithmetic number, because the mean of its divisors is an integer number (11962080).

Almost surely, 2^191423853 is an apocalyptic number.

It is an amenable number.

191423853 is a deficient number, since it is larger than the sum of its proper divisors (95666067).

191423853 is a wasteful number, since it uses less digits than its factorization.

191423853 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4049 (or 4046 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 191423853 is about 13835.6009265951. The cubic root of 191423853 is about 576.3222029067.

The spelling of 191423853 in words is "one hundred ninety-one million, four hundred twenty-three thousand, eight hundred fifty-three".