191381005 has 8 divisors (see below), whose sum is σ = 237576600. Its totient is φ = 147825216.

The previous prime is 191380993. The next prime is 191381017. The reversal of 191381005 is 500183191.

191381005 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (191380993) and next prime (191381017).

It can be written as a sum of positive squares in 4 ways, for example, as 29735209 + 161645796 = 5453^2 + 12714^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 191381005 - 2²⁷ = 57163277 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 659790 + ... + 660079.

It is an arithmetic number, because the mean of its divisors is an integer number (29697075).

Almost surely, 2^191381005 is an apocalyptic number.

It is an amenable number.

191381005 is a deficient number, since it is larger than the sum of its proper divisors (46195595).

191381005 is a wasteful number, since it uses less digits than its factorization.

191381005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319903.

The product of its (nonzero) digits is 1080, while the sum is 28.

The square root of 191381005 is about 13834.0523708709. The cubic root of 191381005 is about 576.2791986936.

The spelling of 191381005 in words is "one hundred ninety-one million, three hundred eighty-one thousand, five".