138323461 has 2 divisors, whose sum is σ = 138323462. Its totient is φ = 138323460.

The previous prime is 138323459. The next prime is 138323473. The reversal of 138323461 is 164323831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86397025 + 51926436 = 9295^2 + 7206^2 .

It is a cyclic number.

It is not a de Polignac number, because 138323461 - 2¹ = 138323459 is a prime.

Together with 138323459, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138323431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69161730 + 69161731.

It is an arithmetic number, because the mean of its divisors is an integer number (69161731).

Almost surely, 2^138323461 is an apocalyptic number.

It is an amenable number.

138323461 is a deficient number, since it is larger than the sum of its proper divisors (1).

138323461 is an equidigital number, since it uses as much as digits as its factorization.

138323461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10368, while the sum is 31.

The square root of 138323461 is about 11761.0994809159. The cubic root of 138323461 is about 517.1683621235.

The spelling of 138323461 in words is "one hundred thirty-eight million, three hundred twenty-three thousand, four hundred sixty-one".