138099977 has 2 divisors, whose sum is σ = 138099978. Its totient is φ = 138099976.

The previous prime is 138099971. The next prime is 138100019. The reversal of 138099977 is 779990831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129868816 + 8231161 = 11396^2 + 2869^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138099977 is a prime.

It is not a weakly prime, because it can be changed into another prime (138099971) 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, 69049988 + 69049989.

It is an arithmetic number, because the mean of its divisors is an integer number (69049989).

Almost surely, 2^138099977 is an apocalyptic number.

It is an amenable number.

138099977 is a deficient number, since it is larger than the sum of its proper divisors (1).

138099977 is an equidigital number, since it uses as much as digits as its factorization.

138099977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 857304, while the sum is 53.

The square root of 138099977 is about 11751.5946577475. The cubic root of 138099977 is about 516.8896888486.

The spelling of 138099977 in words is "one hundred thirty-eight million, ninety-nine thousand, nine hundred seventy-seven".