139164481 has 4 divisors (see below), whose sum is σ = 139864000. Its totient is φ = 138464964.

The previous prime is 139164479. The next prime is 139164503. The reversal of 139164481 is 184461931.

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: 184461931 = 2671 ⋅69061.

It is a cyclic number.

It is not a de Polignac number, because 139164481 - 2¹ = 139164479 is a prime.

It is a super-2 number, since 2×139164481² = 38733505543998722, 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 139164481.

It is not an unprimeable number, because it can be changed into a prime (139164581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 349461 + ... + 349858.

It is an arithmetic number, because the mean of its divisors is an integer number (34966000).

Almost surely, 2^139164481 is an apocalyptic number.

It is an amenable number.

139164481 is a deficient number, since it is larger than the sum of its proper divisors (699519).

139164481 is an equidigital number, since it uses as much as digits as its factorization.

139164481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 699518.

The product of its digits is 20736, while the sum is 37.

The square root of 139164481 is about 11796.7996083684. The cubic root of 139164481 is about 518.2143895239.

The spelling of 139164481 in words is "one hundred thirty-nine million, one hundred sixty-four thousand, four hundred eighty-one".