139881277 has 2 divisors, whose sum is σ = 139881278. Its totient is φ = 139881276.

The previous prime is 139881227. The next prime is 139881319. The reversal of 139881277 is 772188931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100681156 + 39200121 = 10034^2 + 6261^2 .

It is an emirp because it is prime and its reverse (772188931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139881277 - 2¹⁹ = 139356989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139881227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69940638 + 69940639.

It is an arithmetic number, because the mean of its divisors is an integer number (69940639).

Almost surely, 2^139881277 is an apocalyptic number.

It is an amenable number.

139881277 is a deficient number, since it is larger than the sum of its proper divisors (1).

139881277 is an equidigital number, since it uses as much as digits as its factorization.

139881277 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 169344, while the sum is 46.

The square root of 139881277 is about 11827.1415396959. The cubic root of 139881277 is about 519.1025904663.

The spelling of 139881277 in words is "one hundred thirty-nine million, eight hundred eighty-one thousand, two hundred seventy-seven".