191078641 has 16 divisors (see below), whose sum is σ = 219308544. Its totient is φ = 165109824.

The previous prime is 191078633. The next prime is 191078647. The reversal of 191078641 is 146870191.

191078641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 191078641 - 2³ = 191078633 is a prime.

It is a super-2 number, since 2×191078641² = 73022094092813762, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 191078641.

It is not an unprimeable number, because it can be changed into a prime (191078647) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7255 + ... + 20851.

It is an arithmetic number, because the mean of its divisors is an integer number (13706784).

Almost surely, 2^191078641 is an apocalyptic number.

It is an amenable number.

191078641 is a deficient number, since it is larger than the sum of its proper divisors (28229903).

191078641 is a wasteful number, since it uses less digits than its factorization.

191078641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13680.

The product of its (nonzero) digits is 12096, while the sum is 37.

The square root of 191078641 is about 13823.1197998136. The cubic root of 191078641 is about 575.9755497354.

The spelling of 191078641 in words is "one hundred ninety-one million, seventy-eight thousand, six hundred forty-one".