138159761 has 2 divisors, whose sum is σ = 138159762. Its totient is φ = 138159760.

The previous prime is 138159737. The next prime is 138159767. The reversal of 138159761 is 167951831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132250000 + 5909761 = 11500^2 + 2431^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138159761 is a prime.

It is not a weakly prime, because it can be changed into another prime (138159767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69079880 + 69079881.

It is an arithmetic number, because the mean of its divisors is an integer number (69079881).

Almost surely, 2^138159761 is an apocalyptic number.

It is an amenable number.

138159761 is a deficient number, since it is larger than the sum of its proper divisors (1).

138159761 is an equidigital number, since it uses as much as digits as its factorization.

138159761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 41.

The square root of 138159761 is about 11754.1380373041. The cubic root of 138159761 is about 516.9642659188.

The spelling of 138159761 in words is "one hundred thirty-eight million, one hundred fifty-nine thousand, seven hundred sixty-one".