138583657 has 2 divisors, whose sum is σ = 138583658. Its totient is φ = 138583656.

The previous prime is 138583639. The next prime is 138583661. The reversal of 138583657 is 756385831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 111429136 + 27154521 = 10556^2 + 5211^2 .

It is a cyclic number.

It is not a de Polignac number, because 138583657 - 2¹⁵ = 138550889 is a prime.

It is not a weakly prime, because it can be changed into another prime (138583607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69291828 + 69291829.

It is an arithmetic number, because the mean of its divisors is an integer number (69291829).

Almost surely, 2^138583657 is an apocalyptic number.

It is an amenable number.

138583657 is a deficient number, since it is larger than the sum of its proper divisors (1).

138583657 is an equidigital number, since it uses as much as digits as its factorization.

138583657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 604800, while the sum is 46.

The square root of 138583657 is about 11772.1560047427. The cubic root of 138583657 is about 517.4924354966.

The spelling of 138583657 in words is "one hundred thirty-eight million, five hundred eighty-three thousand, six hundred fifty-seven".