138161477 has 2 divisors, whose sum is σ = 138161478. Its totient is φ = 138161476.

The previous prime is 138161473. The next prime is 138161501. The reversal of 138161477 is 774161831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137686756 + 474721 = 11734^2 + 689^2 .

It is a cyclic number.

It is not a de Polignac number, because 138161477 - 2² = 138161473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138161477.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138161473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69080738 + 69080739.

It is an arithmetic number, because the mean of its divisors is an integer number (69080739).

Almost surely, 2^138161477 is an apocalyptic number.

It is an amenable number.

138161477 is a deficient number, since it is larger than the sum of its proper divisors (1).

138161477 is an equidigital number, since it uses as much as digits as its factorization.

138161477 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28224, while the sum is 38.

The square root of 138161477 is about 11754.2110326470. The cubic root of 138161477 is about 516.9664062116.

The spelling of 138161477 in words is "one hundred thirty-eight million, one hundred sixty-one thousand, four hundred seventy-seven".