102086781 has 8 divisors (see below), whose sum is σ = 136903200. Its totient is φ = 67664112.

The previous prime is 102086759. The next prime is 102086797. The reversal of 102086781 is 187680201.

It is a happy number.

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

It is not a de Polignac number, because 102086781 - 2²⁵ = 68532349 is a prime.

It is a super-2 number, since 2×102086781² = 20843421709883922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102086701) 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, 97831 + ... + 98868.

It is an arithmetic number, because the mean of its divisors is an integer number (17112900).

Almost surely, 2^102086781 is an apocalyptic number.

It is an amenable number.

102086781 is a deficient number, since it is larger than the sum of its proper divisors (34816419).

102086781 is a wasteful number, since it uses less digits than its factorization.

102086781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196875.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 102086781 is about 10103.8003246303. The cubic root of 102086781 is about 467.3653416013.

The spelling of 102086781 in words is "one hundred two million, eighty-six thousand, seven hundred eighty-one".