109121639 has 8 divisors (see below), whose sum is σ = 121575168. Its totient is φ = 97090360.

The previous prime is 109121633. The next prime is 109121669. The reversal of 109121639 is 936121901.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-109121639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109121633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 105017 + ... + 106050.

It is an arithmetic number, because the mean of its divisors is an integer number (15196896).

Almost surely, 2^109121639 is an apocalyptic number.

109121639 is a deficient number, since it is larger than the sum of its proper divisors (12453529).

109121639 is a wasteful number, since it uses less digits than its factorization.

109121639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211125.

The product of its (nonzero) digits is 2916, while the sum is 32.

The square root of 109121639 is about 10446.1303361580. The cubic root of 109121639 is about 477.8632437917.

The spelling of 109121639 in words is "one hundred nine million, one hundred twenty-one thousand, six hundred thirty-nine".