191496781634 has 4 divisors (see below), whose sum is σ = 287245172454. Its totient is φ = 95748390816.

The previous prime is 191496781631. The next prime is 191496781643. The reversal of 191496781634 is 436187694191.

It is a happy number.

191496781634 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 184773601609 + 6723180025 = 429853^2 + 81995^2 .

It is not an unprimeable number, because it can be changed into a prime (191496781631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 47874195407 + ... + 47874195410.

Almost surely, 2^191496781634 is an apocalyptic number.

191496781634 is a deficient number, since it is larger than the sum of its proper divisors (95748390820).

191496781634 is an equidigital number, since it uses as much as digits as its factorization.

191496781634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95748390819.

The product of its digits is 7838208, while the sum is 59.

The spelling of 191496781634 in words is "one hundred ninety-one billion, four hundred ninety-six million, seven hundred eighty-one thousand, six hundred thirty-four".