102839881 has 3 divisors (see below), whose sum is σ = 102850023. Its totient is φ = 102829740.

The previous prime is 102839873. The next prime is 102839899. The reversal of 102839881 is 188938201.

The square root of 102839881 is 10141.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 18567481 + 84272400 = 4309^2 + 9180^2 .

It is not a de Polignac number, because 102839881 - 2³ = 102839873 is a prime.

It is a super-2 number, since 2×102839881² = 21152082248188322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102839861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 5071 + ... + 15211.

It is an arithmetic number, because the mean of its divisors is an integer number (34283341).

Almost surely, 2^102839881 is an apocalyptic number.

102839881 is the 10141-st square number.

102839881 is the 5071-st centered octagonal number.

It is an amenable number.

102839881 is a deficient number, since it is larger than the sum of its proper divisors (10142).

102839881 is an frugal number, since it uses more digits than its factorization.

102839881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20282 (or 10141 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 40.

The cubic root of 102839881 is about 468.5117873254.

It can be divided in two parts, 10283 and 9881, that added together give a square (20164 = 142²).

The spelling of 102839881 in words is "one hundred two million, eight hundred thirty-nine thousand, eight hundred eighty-one".