109639 has 2 divisors, whose sum is σ = 109640. Its totient is φ = 109638.

The previous prime is 109621. The next prime is 109661. The reversal of 109639 is 936901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109639 - 2¹⁵ = 76871 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54819 + 54820.

It is an arithmetic number, because the mean of its divisors is an integer number (54820).

2¹⁰⁹⁶³⁹ is an apocalyptic number.

109639 is a deficient number, since it is larger than the sum of its proper divisors (1).

109639 is an equidigital number, since it uses as much as digits as its factorization.

109639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 109639 is about 331.1178038101. The cubic root of 109639 is about 47.8617258974.

The spelling of 109639 in words is "one hundred nine thousand, six hundred thirty-nine".