191012872 has 24 divisors (see below), whose sum is σ = 360576090. Its totient is φ = 94863360.

The previous prime is 191012849. The next prime is 191012893. The reversal of 191012872 is 278210191.

It can be written as a sum of positive squares in 3 ways, for example, as 157904356 + 33108516 = 12566^2 + 5754^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 297672 + ... + 298312.

Almost surely, 2^191012872 is an apocalyptic number.

It is an amenable number.

191012872 is a deficient number, since it is larger than the sum of its proper divisors (169563218).

191012872 is an equidigital number, since it uses as much as digits as its factorization.

191012872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1033 (or 836 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 191012872 is about 13820.7406458554. The cubic root of 191012872 is about 575.9094588267.

The spelling of 191012872 in words is "one hundred ninety-one million, twelve thousand, eight hundred seventy-two".