191918852 has 12 divisors (see below), whose sum is σ = 344935500. Its totient is φ = 93365856.

The previous prime is 191918851. The next prime is 191918869. The reversal of 191918852 is 258819191.

It can be written as a sum of positive squares in 2 ways, for example, as 150651076 + 41267776 = 12274^2 + 6424^2 .

It is not an unprimeable number, because it can be changed into a prime (191918851) 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, 648227 + ... + 648522.

It is an arithmetic number, because the mean of its divisors is an integer number (28744625).

Almost surely, 2^191918852 is an apocalyptic number.

It is an amenable number.

191918852 is a deficient number, since it is larger than the sum of its proper divisors (153016648).

191918852 is a wasteful number, since it uses less digits than its factorization.

191918852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296790 (or 1296788 counting only the distinct ones).

The product of its digits is 51840, while the sum is 44.

The square root of 191918852 is about 13853.4779748625. The cubic root of 191918852 is about 576.8185419006.

The spelling of 191918852 in words is "one hundred ninety-one million, nine hundred eighteen thousand, eight hundred fifty-two".