138132461 has 2 divisors, whose sum is σ = 138132462. Its totient is φ = 138132460.

The previous prime is 138132437. The next prime is 138132479. The reversal of 138132461 is 164231831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 113827561 + 24304900 = 10669^2 + 4930^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138132461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138132431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69066230 + 69066231.

It is an arithmetic number, because the mean of its divisors is an integer number (69066231).

Almost surely, 2^138132461 is an apocalyptic number.

It is an amenable number.

138132461 is a deficient number, since it is larger than the sum of its proper divisors (1).

138132461 is an equidigital number, since it uses as much as digits as its factorization.

138132461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 29.

The square root of 138132461 is about 11752.9766867802. The cubic root of 138132461 is about 516.9302134228.

The spelling of 138132461 in words is "one hundred thirty-eight million, one hundred thirty-two thousand, four hundred sixty-one".