191555642 has 16 divisors (see below), whose sum is σ = 289247112. Its totient is φ = 95142720.

The previous prime is 191555629. The next prime is 191555647. The reversal of 191555642 is 246555191.

It can be written as a sum of positive squares in 4 ways, for example, as 111112681 + 80442961 = 10541^2 + 8969^2 .

It is a junction number, because it is equal to n+sod(n) for n = 191555596 and 191555605.

It is not an unprimeable number, because it can be changed into a prime (191555647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 343628 + ... + 344184.

Almost surely, 2^191555642 is an apocalyptic number.

191555642 is a deficient number, since it is larger than the sum of its proper divisors (97691470).

191555642 is a wasteful number, since it uses less digits than its factorization.

191555642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1393.

The product of its digits is 54000, while the sum is 38.

The square root of 191555642 is about 13840.3627842626. The cubic root of 191555642 is about 576.4544321664.

The spelling of 191555642 in words is "one hundred ninety-one million, five hundred fifty-five thousand, six hundred forty-two".