138610777 has 2 divisors, whose sum is σ = 138610778. Its totient is φ = 138610776.

The previous prime is 138610763. The next prime is 138610783. The reversal of 138610777 is 777016831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96412761 + 42198016 = 9819^2 + 6496^2 .

It is a cyclic number.

It is not a de Polignac number, because 138610777 - 2⁷ = 138610649 is a prime.

It is not a weakly prime, because it can be changed into another prime (138619777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69305388 + 69305389.

It is an arithmetic number, because the mean of its divisors is an integer number (69305389).

Almost surely, 2^138610777 is an apocalyptic number.

It is an amenable number.

138610777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138610777 is an equidigital number, since it uses as much as digits as its factorization.

138610777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 49392, while the sum is 40.

The square root of 138610777 is about 11773.3078189607. The cubic root of 138610777 is about 517.5261900287.

The spelling of 138610777 in words is "one hundred thirty-eight million, six hundred ten thousand, seven hundred seventy-seven".