139129081 has 36 divisors (see below), whose sum is σ = 179121132. Its totient is φ = 107662464.

The previous prime is 139129073. The next prime is 139129127. The reversal of 139129081 is 180921931.

139129081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 37945600 + 101183481 = 6160^2 + 10059^2 .

It is not a de Polignac number, because 139129081 - 2³ = 139129073 is a prime.

It is a super-2 number, since 2×139129081² = 38713802359809122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139129061) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 438735 + ... + 439051.

It is an arithmetic number, because the mean of its divisors is an integer number (4975587).

Almost surely, 2^139129081 is an apocalyptic number.

It is an amenable number.

139129081 is a deficient number, since it is larger than the sum of its proper divisors (39992051).

139129081 is a wasteful number, since it uses less digits than its factorization.

139129081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 34.

The square root of 139129081 is about 11795.2991059998. The cubic root of 139129081 is about 518.1704454922.

The spelling of 139129081 in words is "one hundred thirty-nine million, one hundred twenty-nine thousand, eighty-one".