138951121 has 2 divisors, whose sum is σ = 138951122. Its totient is φ = 138951120.

The previous prime is 138951101. The next prime is 138951133. The reversal of 138951121 is 121159831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119246400 + 19704721 = 10920^2 + 4439^2 .

It is a cyclic number.

It is not a de Polignac number, because 138951121 - 2⁵ = 138951089 is a prime.

It is not a weakly prime, because it can be changed into another prime (138951101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69475560 + 69475561.

It is an arithmetic number, because the mean of its divisors is an integer number (69475561).

Almost surely, 2^138951121 is an apocalyptic number.

It is an amenable number.

138951121 is a deficient number, since it is larger than the sum of its proper divisors (1).

138951121 is an equidigital number, since it uses as much as digits as its factorization.

138951121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2160, while the sum is 31.

The square root of 138951121 is about 11787.7530089496. The cubic root of 138951121 is about 517.9494206315.

The spelling of 138951121 in words is "one hundred thirty-eight million, nine hundred fifty-one thousand, one hundred twenty-one".