190806681 has 8 divisors (see below), whose sum is σ = 273978880. Its totient is φ = 117419472.

The previous prime is 190806677. The next prime is 190806713. The reversal of 190806681 is 186608091.

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

It is not a de Polignac number, because 190806681 - 2² = 190806677 is a prime.

It is a super-2 number, since 2×190806681² = 72814379028471522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 4892479 = 190806681 / (1 + 9 + 0 + 8 + 0 + 6 + 6 + 8 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190806601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2446201 + ... + 2446278.

It is an arithmetic number, because the mean of its divisors is an integer number (34247360).

Almost surely, 2^190806681 is an apocalyptic number.

It is an amenable number.

190806681 is a deficient number, since it is larger than the sum of its proper divisors (83172199).

190806681 is a wasteful number, since it uses less digits than its factorization.

190806681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4892495.

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 190806681 is about 13813.2791544948. The cubic root of 190806681 is about 575.7021602307.

The spelling of 190806681 in words is "one hundred ninety million, eight hundred six thousand, six hundred eighty-one".