138001001 has 2 divisors, whose sum is σ = 138001002. Its totient is φ = 138001000.

The previous prime is 138000991. The next prime is 138001037. The reversal of 138001001 is 100100831.

138001001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 106584976 + 31416025 = 10324^2 + 5605^2 .

It is a cyclic number.

It is not a de Polignac number, because 138001001 - 2¹⁸ = 137738857 is a prime.

138001001 is a modest number, since divided by 1001 gives 138 as remainder.

It is not a weakly prime, because it can be changed into another prime (138001051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69000500 + 69000501.

It is an arithmetic number, because the mean of its divisors is an integer number (69000501).

Almost surely, 2^138001001 is an apocalyptic number.

It is an amenable number.

138001001 is a deficient number, since it is larger than the sum of its proper divisors (1).

138001001 is an equidigital number, since it uses as much as digits as its factorization.

138001001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 14.

The square root of 138001001 is about 11747.3827297828. The cubic root of 138001001 is about 516.7661747060.

Adding to 138001001 its reverse (100100831), we get a palindrome (238101832).

The spelling of 138001001 in words is "one hundred thirty-eight million, one thousand, one".