138757579 has 2 divisors, whose sum is σ = 138757580. Its totient is φ = 138757578.

The previous prime is 138757529. The next prime is 138757631. The reversal of 138757579 is 975757831.

It is an a-pointer prime, because the next prime (138757631) can be obtained adding 138757579 to its sum of digits (52).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138757579 - 2²¹ = 136660427 is a prime.

It is not a weakly prime, because it can be changed into another prime (138757529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69378789 + 69378790.

It is an arithmetic number, because the mean of its divisors is an integer number (69378790).

Almost surely, 2^138757579 is an apocalyptic number.

138757579 is a deficient number, since it is larger than the sum of its proper divisors (1).

138757579 is an equidigital number, since it uses as much as digits as its factorization.

138757579 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1852200, while the sum is 52.

The square root of 138757579 is about 11779.5406956299. The cubic root of 138757579 is about 517.7088287238.

The spelling of 138757579 in words is "one hundred thirty-eight million, seven hundred fifty-seven thousand, five hundred seventy-nine".