191320642 has 4 divisors (see below), whose sum is σ = 286980966. Its totient is φ = 95660320.

The previous prime is 191320621. The next prime is 191320643. The reversal of 191320642 is 246023191.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 152992161 + 38328481 = 12369^2 + 6191^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 191320642.

It is not an unprimeable number, because it can be changed into a prime (191320643) 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 as a sum of consecutive naturals, namely, 47830159 + ... + 47830162.

Almost surely, 2^191320642 is an apocalyptic number.

191320642 is a deficient number, since it is larger than the sum of its proper divisors (95660324).

191320642 is an equidigital number, since it uses as much as digits as its factorization.

191320642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95660323.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 191320642 is about 13831.8705170342. The cubic root of 191320642 is about 576.2186047332.

The spelling of 191320642 in words is "one hundred ninety-one million, three hundred twenty thousand, six hundred forty-two".