139162609 has 2 divisors, whose sum is σ = 139162610. Its totient is φ = 139162608.

The previous prime is 139162607. The next prime is 139162643. The reversal of 139162609 is 906261931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 111830625 + 27331984 = 10575^2 + 5228^2 .

It is a cyclic number.

It is not a de Polignac number, because 139162609 - 2¹ = 139162607 is a prime.

Together with 139162607, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (139162607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69581304 + 69581305.

It is an arithmetic number, because the mean of its divisors is an integer number (69581305).

Almost surely, 2^139162609 is an apocalyptic number.

It is an amenable number.

139162609 is a deficient number, since it is larger than the sum of its proper divisors (1).

139162609 is an equidigital number, since it uses as much as digits as its factorization.

139162609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 139162609 is about 11796.7202645481. The cubic root of 139162609 is about 518.2120658906.

It can be divided in two parts, 1391 and 62609, that added together give a cube (64000 = 40³).

The spelling of 139162609 in words is "one hundred thirty-nine million, one hundred sixty-two thousand, six hundred nine".