139774681 has 2 divisors, whose sum is σ = 139774682. Its totient is φ = 139774680.

The previous prime is 139774673. The next prime is 139774709. The reversal of 139774681 is 186477931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 138862656 + 912025 = 11784^2 + 955^2 .

It is an emirp because it is prime and its reverse (186477931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139774681 - 2³ = 139774673 is a prime.

It is a super-2 number, since 2×139774681² = 39073922897303522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (139774601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69887340 + 69887341.

It is an arithmetic number, because the mean of its divisors is an integer number (69887341).

Almost surely, 2^139774681 is an apocalyptic number.

It is an amenable number.

139774681 is a deficient number, since it is larger than the sum of its proper divisors (1).

139774681 is an equidigital number, since it uses as much as digits as its factorization.

139774681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 46.

The square root of 139774681 is about 11822.6342665245. The cubic root of 139774681 is about 518.9706969000.

The spelling of 139774681 in words is "one hundred thirty-nine million, seven hundred seventy-four thousand, six hundred eighty-one".