191864542 has 8 divisors (see below), whose sum is σ = 288522936. Its totient is φ = 95690232.

The previous prime is 191864539. The next prime is 191864587. The reversal of 191864542 is 245468191.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 191864495 and 191864504.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120028 + ... + 121615.

It is an arithmetic number, because the mean of its divisors is an integer number (36065367).

Almost surely, 2^191864542 is an apocalyptic number.

191864542 is a deficient number, since it is larger than the sum of its proper divisors (96658394).

191864542 is a wasteful number, since it uses less digits than its factorization.

191864542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242042.

The product of its digits is 69120, while the sum is 40.

The square root of 191864542 is about 13851.5176785795. The cubic root of 191864542 is about 576.7641265923.

The spelling of 191864542 in words is "one hundred ninety-one million, eight hundred sixty-four thousand, five hundred forty-two".