191220542 has 8 divisors (see below), whose sum is σ = 286894632. Its totient is φ = 95589000.

The previous prime is 191220529. The next prime is 191220563. The reversal of 191220542 is 245022191.

191220542 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5492 + ... + 20312.

It is an arithmetic number, because the mean of its divisors is an integer number (35861829).

Almost surely, 2^191220542 is an apocalyptic number.

191220542 is a deficient number, since it is larger than the sum of its proper divisors (95674090).

191220542 is a wasteful number, since it uses less digits than its factorization.

191220542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21274.

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 191220542 is about 13828.2515886861. The cubic root of 191220542 is about 576.1180936329.

The spelling of 191220542 in words is "one hundred ninety-one million, two hundred twenty thousand, five hundred forty-two".