139019161 has 2 divisors, whose sum is σ = 139019162. Its totient is φ = 139019160.

The previous prime is 139019141. The next prime is 139019173. The reversal of 139019161 is 161910931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128391561 + 10627600 = 11331^2 + 3260^2 .

It is a cyclic number.

It is not a de Polignac number, because 139019161 - 2⁷ = 139019033 is a prime.

It is not a weakly prime, because it can be changed into another prime (139019131) 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 as a sum of consecutive naturals, namely, 69509580 + 69509581.

It is an arithmetic number, because the mean of its divisors is an integer number (69509581).

Almost surely, 2^139019161 is an apocalyptic number.

It is an amenable number.

139019161 is a deficient number, since it is larger than the sum of its proper divisors (1).

139019161 is an equidigital number, since it uses as much as digits as its factorization.

139019161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 31.

The square root of 139019161 is about 11790.6387019533. The cubic root of 139019161 is about 518.0339480243.

The spelling of 139019161 in words is "one hundred thirty-nine million, nineteen thousand, one hundred sixty-one".