102138437 has 2 divisors, whose sum is σ = 102138438. Its totient is φ = 102138436.

The previous prime is 102138401. The next prime is 102138467. The reversal of 102138437 is 734831201.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 97337956 + 4800481 = 9866^2 + 2191^2 .

It is a cyclic number.

It is not a de Polignac number, because 102138437 - 2⁸ = 102138181 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102138467) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51069218 + 51069219.

It is an arithmetic number, because the mean of its divisors is an integer number (51069219).

Almost surely, 2^102138437 is an apocalyptic number.

It is an amenable number.

102138437 is a deficient number, since it is larger than the sum of its proper divisors (1).

102138437 is an equidigital number, since it uses as much as digits as its factorization.

102138437 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 102138437 is about 10106.3562672211. The cubic root of 102138437 is about 467.4441573990. Note that the first 3 decimals are identical.

Adding to 102138437 its reverse (734831201), we get a palindrome (836969638).

The spelling of 102138437 in words is "one hundred two million, one hundred thirty-eight thousand, four hundred thirty-seven".