191680887 has 8 divisors (see below), whose sum is σ = 256392304. Its totient is φ = 127378368.

The previous prime is 191680877. The next prime is 191680943. The reversal of 191680887 is 788086191.

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

It is not a de Polignac number, because 191680887 - 2⁶ = 191680823 is a prime.

It is a super-2 number, since 2×191680887² = 73483124882213538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (191680817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101128 + ... + 103005.

It is an arithmetic number, because the mean of its divisors is an integer number (32049038).

Almost surely, 2^191680887 is an apocalyptic number.

191680887 is a deficient number, since it is larger than the sum of its proper divisors (64711417).

191680887 is a wasteful number, since it uses less digits than its factorization.

191680887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204449.

The product of its (nonzero) digits is 193536, while the sum is 48.

The square root of 191680887 is about 13844.8866734257. The cubic root of 191680887 is about 576.5800393707.

The spelling of 191680887 in words is "one hundred ninety-one million, six hundred eighty thousand, eight hundred eighty-seven".