102138401 has 2 divisors, whose sum is σ = 102138402. Its totient is φ = 102138400.

The previous prime is 102138383. The next prime is 102138437. The reversal of 102138401 is 104831201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 79566400 + 22572001 = 8920^2 + 4751^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102138401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (102138301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51069200 + 51069201.

It is an arithmetic number, because the mean of its divisors is an integer number (51069201).

Almost surely, 2^102138401 is an apocalyptic number.

It is an amenable number.

102138401 is a deficient number, since it is larger than the sum of its proper divisors (1).

102138401 is an equidigital number, since it uses as much as digits as its factorization.

102138401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 102138401 is about 10106.3544861636. The cubic root of 102138401 is about 467.4441024801. Note that the first 3 decimals are identical.

Adding to 102138401 its reverse (104831201), we get a palindrome (206969602).

The spelling of 102138401 in words is "one hundred two million, one hundred thirty-eight thousand, four hundred one".