191918853 has 12 divisors (see below), whose sum is σ = 316818528. Its totient is φ = 109667880.

The previous prime is 191918851. The next prime is 191918869. The reversal of 191918853 is 358819191.

It is not a de Polignac number, because 191918853 - 2¹ = 191918851 is a prime.

It is a super-2 number, since 2×191918853² = 73665692273671218, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191918799 and 191918808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191918851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1523103 + ... + 1523228.

It is an arithmetic number, because the mean of its divisors is an integer number (26401544).

Almost surely, 2^191918853 is an apocalyptic number.

It is an amenable number.

191918853 is a deficient number, since it is larger than the sum of its proper divisors (124899675).

191918853 is a wasteful number, since it uses less digits than its factorization.

191918853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3046344 (or 3046341 counting only the distinct ones).

The product of its digits is 77760, while the sum is 45.

The square root of 191918853 is about 13853.4780109545. The cubic root of 191918853 is about 576.8185429024.

The spelling of 191918853 in words is "one hundred ninety-one million, nine hundred eighteen thousand, eight hundred fifty-three".