102431639 has 2 divisors, whose sum is σ = 102431640. Its totient is φ = 102431638.

The previous prime is 102431597. The next prime is 102431671. The reversal of 102431639 is 936134201.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102431639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (102431699) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 51215819 + 51215820.

It is an arithmetic number, because the mean of its divisors is an integer number (51215820).

Almost surely, 2^102431639 is an apocalyptic number.

102431639 is a deficient number, since it is larger than the sum of its proper divisors (1).

102431639 is an equidigital number, since it uses as much as digits as its factorization.

102431639 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 102431639 is about 10120.8516934100. The cubic root of 102431639 is about 467.8910170051.

The spelling of 102431639 in words is "one hundred two million, four hundred thirty-one thousand, six hundred thirty-nine".