139484581 has 4 divisors (see below), whose sum is σ = 145549152. Its totient is φ = 133420012.

The previous prime is 139484551. The next prime is 139484591. The reversal of 139484581 is 185484931.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 185484931 = 3313 ⋅55987.

It is a cyclic number.

It is not a de Polignac number, because 139484581 - 2⁵ = 139484549 is a prime.

It is a super-2 number, since 2×139484581² = 38911896673491122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139484551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3032251 + ... + 3032296.

It is an arithmetic number, because the mean of its divisors is an integer number (36387288).

Almost surely, 2^139484581 is an apocalyptic number.

It is an amenable number.

139484581 is a deficient number, since it is larger than the sum of its proper divisors (6064571).

139484581 is an equidigital number, since it uses as much as digits as its factorization.

139484581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6064570.

The product of its digits is 138240, while the sum is 43.

The square root of 139484581 is about 11810.3590546604. The cubic root of 139484581 is about 518.6114099024.

The spelling of 139484581 in words is "one hundred thirty-nine million, four hundred eighty-four thousand, five hundred eighty-one".