102631439 has 2 divisors, whose sum is σ = 102631440. Its totient is φ = 102631438.

The previous prime is 102631433. The next prime is 102631447. The reversal of 102631439 is 934136201.

It is a weak prime.

It is an emirp because it is prime and its reverse (934136201) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102631439 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102631433) 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, 51315719 + 51315720.

It is an arithmetic number, because the mean of its divisors is an integer number (51315720).

Almost surely, 2^102631439 is an apocalyptic number.

102631439 is a deficient number, since it is larger than the sum of its proper divisors (1).

102631439 is an equidigital number, since it uses as much as digits as its factorization.

102631439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 102631439 is about 10130.7175955112. The cubic root of 102631439 is about 468.1950373552.

The spelling of 102631439 in words is "one hundred two million, six hundred thirty-one thousand, four hundred thirty-nine".