109212639 has 8 divisors (see below), whose sum is σ = 145915392. Its totient is φ = 72659160.

The previous prime is 109212629. The next prime is 109212667. The reversal of 109212639 is 936212901.

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

It is not a de Polignac number, because 109212639 - 2⁷ = 109212511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109212629) 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, 35599 + ... + 38544.

It is an arithmetic number, because the mean of its divisors is an integer number (18239424).

Almost surely, 2^109212639 is an apocalyptic number.

109212639 is a deficient number, since it is larger than the sum of its proper divisors (36702753).

109212639 is an equidigital number, since it uses as much as digits as its factorization.

109212639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74637.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 109212639 is about 10450.4851083574. The cubic root of 109212639 is about 477.9960419950.

It can be divided in two parts, 1092 and 12639, that added together give a palindrome (13731).

The spelling of 109212639 in words is "one hundred nine million, two hundred twelve thousand, six hundred thirty-nine".