139029481 has 4 divisors (see below), whose sum is σ = 140591700. Its totient is φ = 137467264.

The previous prime is 139029439. The next prime is 139029491. The reversal of 139029481 is 184920931.

139029481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73273600 + 65755881 = 8560^2 + 8109^2 .

It is not a de Polignac number, because 139029481 - 2⁷ = 139029353 is a prime.

It is a super-2 number, since 2×139029481² = 38658393174258722, 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 139029481.

It is not an unprimeable number, because it can be changed into a prime (139029491) 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, 780976 + ... + 781153.

It is an arithmetic number, because the mean of its divisors is an integer number (35147925).

Almost surely, 2^139029481 is an apocalyptic number.

It is an amenable number.

139029481 is a deficient number, since it is larger than the sum of its proper divisors (1562219).

139029481 is an equidigital number, since it uses as much as digits as its factorization.

139029481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1562218.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 139029481 is about 11791.0763291567. The cubic root of 139029481 is about 518.0467663486.

The spelling of 139029481 in words is "one hundred thirty-nine million, twenty-nine thousand, four hundred eighty-one".