139812481 has 8 divisors (see below), whose sum is σ = 141111720. Its totient is φ = 138519552.

The previous prime is 139812467. The next prime is 139812487. The reversal of 139812481 is 184218931.

It can be written as a sum of positive squares in 4 ways, for example, as 360000 + 139452481 = 600^2 + 11809^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 139812481 - 2¹³ = 139804289 is a prime.

It is a super-2 number, since 2×139812481² = 39095059686750722, 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 139812481.

It is not an unprimeable number, because it can be changed into a prime (139812487) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50571 + ... + 53263.

It is an arithmetic number, because the mean of its divisors is an integer number (17638965).

Almost surely, 2^139812481 is an apocalyptic number.

It is an amenable number.

139812481 is a deficient number, since it is larger than the sum of its proper divisors (1299239).

139812481 is a wasteful number, since it uses less digits than its factorization.

139812481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3155.

The product of its digits is 13824, while the sum is 37.

The square root of 139812481 is about 11824.2327869507. The cubic root of 139812481 is about 519.0174753392.

The spelling of 139812481 in words is "one hundred thirty-nine million, eight hundred twelve thousand, four hundred eighty-one".