139461181 has 2 divisors, whose sum is σ = 139461182. Its totient is φ = 139461180.

The previous prime is 139461163. The next prime is 139461187. The reversal of 139461181 is 181164931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113103225 + 26357956 = 10635^2 + 5134^2 .

It is a cyclic number.

It is not a de Polignac number, because 139461181 - 2⁷ = 139461053 is a prime.

It is a super-2 number, since 2×139461181² = 38898842011829522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139461187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69730590 + 69730591.

It is an arithmetic number, because the mean of its divisors is an integer number (69730591).

Almost surely, 2^139461181 is an apocalyptic number.

It is an amenable number.

139461181 is a deficient number, since it is larger than the sum of its proper divisors (1).

139461181 is an equidigital number, since it uses as much as digits as its factorization.

139461181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 139461181 is about 11809.3683573678. The cubic root of 139461181 is about 518.5824074478.

The spelling of 139461181 in words is "one hundred thirty-nine million, four hundred sixty-one thousand, one hundred eighty-one".