138455870381 has 2 divisors, whose sum is σ = 138455870382. Its totient is φ = 138455870380.

The previous prime is 138455870341. The next prime is 138455870453. The reversal of 138455870381 is 183078554831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 134270944900 + 4184925481 = 366430^2 + 64691^2 .

It is a cyclic number.

It is not a de Polignac number, because 138455870381 - 2⁶ = 138455870317 is a prime.

It is a super-2 number, since 2×138455870381² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138455870341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69227935190 + 69227935191.

It is an arithmetic number, because the mean of its divisors is an integer number (69227935191).

Almost surely, 2^138455870381 is an apocalyptic number.

It is an amenable number.

138455870381 is a deficient number, since it is larger than the sum of its proper divisors (1).

138455870381 is an equidigital number, since it uses as much as digits as its factorization.

138455870381 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3225600, while the sum is 53.

The spelling of 138455870381 in words is "one hundred thirty-eight billion, four hundred fifty-five million, eight hundred seventy thousand, three hundred eighty-one".