106831691578 has 4 divisors (see below), whose sum is σ = 160247537370. Its totient is φ = 53415845788.

The previous prime is 106831691531. The next prime is 106831691579. The reversal of 106831691578 is 875196138601.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 875196138601 = 9403 ⋅93076267.

It can be written as a sum of positive squares in only one way, i.e., 86378973409 + 20452718169 = 293903^2 + 143013^2 .

It is a super-2 number, since 2×106831691578² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (106831691579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26707922893 + ... + 26707922896.

Almost surely, 2^106831691578 is an apocalyptic number.

106831691578 is a deficient number, since it is larger than the sum of its proper divisors (53415845792).

106831691578 is an equidigital number, since it uses as much as digits as its factorization.

106831691578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53415845791.

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 106831691578 in words is "one hundred six billion, eight hundred thirty-one million, six hundred ninety-one thousand, five hundred seventy-eight".