138461657 has 2 divisors, whose sum is σ = 138461658. Its totient is φ = 138461656.

The previous prime is 138461639. The next prime is 138461663. The reversal of 138461657 is 756164831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 121969936 + 16491721 = 11044^2 + 4061^2 .

It is a cyclic number.

It is not a de Polignac number, because 138461657 - 2¹⁸ = 138199513 is a prime.

It is not a weakly prime, because it can be changed into another prime (138461627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69230828 + 69230829.

It is an arithmetic number, because the mean of its divisors is an integer number (69230829).

Almost surely, 2^138461657 is an apocalyptic number.

It is an amenable number.

138461657 is a deficient number, since it is larger than the sum of its proper divisors (1).

138461657 is an equidigital number, since it uses as much as digits as its factorization.

It is an anagram of its base 9 representation: 138461657 = (318476615)₉.

138461657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 120960, while the sum is 41.

The square root of 138461657 is about 11766.9731452060. The cubic root of 138461657 is about 517.3405354002.

The spelling of 138461657 in words is "one hundred thirty-eight million, four hundred sixty-one thousand, six hundred fifty-seven".