161010139 has 2 divisors, whose sum is σ = 161010140. Its totient is φ = 161010138.

The previous prime is 161010133. The next prime is 161010149. The reversal of 161010139 is 931010161.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (931010161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161010139 - 2⁵ = 161010107 is a prime.

It is not a weakly prime, because it can be changed into another prime (161010133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80505069 + 80505070.

It is an arithmetic number, because the mean of its divisors is an integer number (80505070).

Almost surely, 2^161010139 is an apocalyptic number.

161010139 is a deficient number, since it is larger than the sum of its proper divisors (1).

161010139 is an equidigital number, since it uses as much as digits as its factorization.

161010139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 22.

The square root of 161010139 is about 12688.9770667300. The cubic root of 161010139 is about 544.0236020523.

Adding to 161010139 its sum of digits (22), we get a palindrome (161010161).

The spelling of 161010139 in words is "one hundred sixty-one million, ten thousand, one hundred thirty-nine".