139086181 has 16 divisors (see below), whose sum is σ = 155312640. Its totient is φ = 123687360.

The previous prime is 139086173. The next prime is 139086203. The reversal of 139086181 is 181680931.

139086181 is a nontrivial binomial coefficient, being equal to C(16679, 2).

It is a cyclic number.

It is not a de Polignac number, because 139086181 - 2³ = 139086173 is a prime.

It is a super-2 number, since 2×139086181² = 38689931490329522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 139086181.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139086781) 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 15 ways as a sum of consecutive naturals, for example, 107766 + ... + 109048.

It is an arithmetic number, because the mean of its divisors is an integer number (9707040).

Almost surely, 2^139086181 is an apocalyptic number.

139086181 is the 16678-th triangular number.

139086181 is the 5560-th centered nonagonal number.

It is an amenable number.

139086181 is a deficient number, since it is larger than the sum of its proper divisors (16226459).

139086181 is a wasteful number, since it uses less digits than its factorization.

139086181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1596.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 139086181 is about 11793.4804447203. The cubic root of 139086181 is about 518.1171812929.

It can be divided in two parts, 1390 and 86181, that added together give a triangular number (87571 = T₄₁₈).

The spelling of 139086181 in words is "one hundred thirty-nine million, eighty-six thousand, one hundred eighty-one".