139047961 has 18 divisors (see below), whose sum is σ = 155003562. Its totient is φ = 124675200.

The previous prime is 139047959. The next prime is 139047967. The reversal of 139047961 is 169740931.

It can be written as a sum of positive squares in 9 ways, for example, as 2742336 + 136305625 = 1656^2 + 11675^2 .

It is not a de Polignac number, because 139047961 - 2¹ = 139047959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (139047967) 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 17 ways as a sum of consecutive naturals, for example, 231061 + ... + 231661.

It is an arithmetic number, because the mean of its divisors is an integer number (8611309).

Almost surely, 2^139047961 is an apocalyptic number.

It is an amenable number.

139047961 is a deficient number, since it is larger than the sum of its proper divisors (15955601).

139047961 is an equidigital number, since it uses as much as digits as its factorization.

139047961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 651 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 139047961 is about 11791.8599465903. The cubic root of 139047961 is about 518.0697185072.

The spelling of 139047961 in words is "one hundred thirty-nine million, forty-seven thousand, nine hundred sixty-one".