102131389 has 2 divisors, whose sum is σ = 102131390. Its totient is φ = 102131388.

The previous prime is 102131387. The next prime is 102131411. The reversal of 102131389 is 983131201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67815225 + 34316164 = 8235^2 + 5858^2 .

It is a cyclic number.

It is not a de Polignac number, because 102131389 - 2¹ = 102131387 is a prime.

Together with 102131387, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102131387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51065694 + 51065695.

It is an arithmetic number, because the mean of its divisors is an integer number (51065695).

Almost surely, 2^102131389 is an apocalyptic number.

It is an amenable number.

102131389 is a deficient number, since it is larger than the sum of its proper divisors (1).

102131389 is an equidigital number, since it uses as much as digits as its factorization.

102131389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 102131389 is about 10106.0075697577. The cubic root of 102131389 is about 467.4334052529.

The spelling of 102131389 in words is "one hundred two million, one hundred thirty-one thousand, three hundred eighty-nine".