139670761 has 2 divisors, whose sum is σ = 139670762. Its totient is φ = 139670760.

The previous prime is 139670753. The next prime is 139670777. The reversal of 139670761 is 167076931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79995136 + 59675625 = 8944^2 + 7725^2 .

It is a cyclic number.

It is not a de Polignac number, because 139670761 - 2³ = 139670753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139670701) 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 as a sum of consecutive naturals, namely, 69835380 + 69835381.

It is an arithmetic number, because the mean of its divisors is an integer number (69835381).

Almost surely, 2^139670761 is an apocalyptic number.

It is an amenable number.

139670761 is a deficient number, since it is larger than the sum of its proper divisors (1).

139670761 is an equidigital number, since it uses as much as digits as its factorization.

139670761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 139670761 is about 11818.2384897243. The cubic root of 139670761 is about 518.8420498383.

The spelling of 139670761 in words is "one hundred thirty-nine million, six hundred seventy thousand, seven hundred sixty-one".