139172481 has 24 divisors (see below), whose sum is σ = 230106240. Its totient is φ = 79402176.

The previous prime is 139172461. The next prime is 139172507. The reversal of 139172481 is 184271931.

It is a happy number.

139172481 is a `hidden beast` number, since 1 + 3 + 9 + 172 + 481 = 666.

It is not a de Polignac number, because 139172481 - 2⁹ = 139171969 is a prime.

It is a super-2 number, since 2×139172481² = 38737958935390722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139172401) 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 23 ways as a sum of consecutive naturals, for example, 51541 + ... + 54173.

It is an arithmetic number, because the mean of its divisors is an integer number (9587760).

Almost surely, 2^139172481 is an apocalyptic number.

It is an amenable number.

139172481 is a deficient number, since it is larger than the sum of its proper divisors (90933759).

139172481 is a wasteful number, since it uses less digits than its factorization.

139172481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3485 (or 3482 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 139172481 is about 11797.1386785101. The cubic root of 139172481 is about 518.2243193462.

The spelling of 139172481 in words is "one hundred thirty-nine million, one hundred seventy-two thousand, four hundred eighty-one".