191090642 has 16 divisors (see below), whose sum is σ = 303753240. Its totient is φ = 89849088.

The previous prime is 191090629. The next prime is 191090671. The reversal of 191090642 is 246090191.

191090642 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 141824281 + 49266361 = 11909^2 + 7019^2 .

It is a super-3 number, since 3×191090642³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 191090599 and 191090608.

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 7 ways as a sum of consecutive naturals, for example, 75908 + ... + 78384.

Almost surely, 2^191090642 is an apocalyptic number.

191090642 is a deficient number, since it is larger than the sum of its proper divisors (112662598).

191090642 is a wasteful number, since it uses less digits than its factorization.

191090642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4765.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 191090642 is about 13823.5538845841. The cubic root of 191090642 is about 575.9876078385.

The spelling of 191090642 in words is "one hundred ninety-one million, ninety thousand, six hundred forty-two".