138227461 has 2 divisors, whose sum is σ = 138227462. Its totient is φ = 138227460.

The previous prime is 138227431. The next prime is 138227473. The reversal of 138227461 is 164722831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136773025 + 1454436 = 11695^2 + 1206^2 .

It is a cyclic number.

It is not a de Polignac number, because 138227461 - 2¹¹ = 138225413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138227431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69113730 + 69113731.

It is an arithmetic number, because the mean of its divisors is an integer number (69113731).

Almost surely, 2^138227461 is an apocalyptic number.

It is an amenable number.

138227461 is a deficient number, since it is larger than the sum of its proper divisors (1).

138227461 is an equidigital number, since it uses as much as digits as its factorization.

138227461 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 34.

The square root of 138227461 is about 11757.0175214635. The cubic root of 138227461 is about 517.0486917689.

The spelling of 138227461 in words is "one hundred thirty-eight million, two hundred twenty-seven thousand, four hundred sixty-one".