139189281 has 16 divisors (see below), whose sum is σ = 231379968. Its totient is φ = 72306000.

The previous prime is 139189273. The next prime is 139189291. The reversal of 139189281 is 182981931.

It is not a de Polignac number, because 139189281 - 2³ = 139189273 is a prime.

It is a super-2 number, since 2×139189281² = 38747311890593922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139189291) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 301045 + ... + 301506.

It is an arithmetic number, because the mean of its divisors is an integer number (14461248).

Almost surely, 2^139189281 is an apocalyptic number.

139189281 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

139189281 is a deficient number, since it is larger than the sum of its proper divisors (92190687).

139189281 is a wasteful number, since it uses less digits than its factorization.

139189281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602572.

The product of its digits is 31104, while the sum is 42.

The square root of 139189281 is about 11797.8506940883. The cubic root of 139189281 is about 518.2451707343.

It can be divided in two parts, 139 and 189281, that added together give a triangular number (189420 = T₆₁₅).

The spelling of 139189281 in words is "one hundred thirty-nine million, one hundred eighty-nine thousand, two hundred eighty-one".