138976577 has 2 divisors, whose sum is σ = 138976578. Its totient is φ = 138976576.

The previous prime is 138976573. The next prime is 138976619. The reversal of 138976577 is 775679831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118897216 + 20079361 = 10904^2 + 4481^2 .

It is a cyclic number.

It is not a de Polignac number, because 138976577 - 2² = 138976573 is a prime.

It is not a weakly prime, because it can be changed into another prime (138976573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69488288 + 69488289.

It is an arithmetic number, because the mean of its divisors is an integer number (69488289).

Almost surely, 2^138976577 is an apocalyptic number.

It is an amenable number.

138976577 is a deficient number, since it is larger than the sum of its proper divisors (1).

138976577 is an equidigital number, since it uses as much as digits as its factorization.

138976577 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2222640, while the sum is 53.

The square root of 138976577 is about 11788.8327242353. The cubic root of 138976577 is about 517.9810483369.

The spelling of 138976577 in words is "one hundred thirty-eight million, nine hundred seventy-six thousand, five hundred seventy-seven".