109638431 has 6 divisors (see below), whose sum is σ = 127538640. Its totient is φ = 93975756.

The previous prime is 109638427. The next prime is 109638439. The reversal of 109638431 is 134836901.

It is not a de Polignac number, because 109638431 - 2² = 109638427 is a prime.

It is a super-2 number, since 2×109638431² = 24041171104283522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 109638391 and 109638400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109638439) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1118711 + ... + 1118808.

It is an arithmetic number, because the mean of its divisors is an integer number (21256440).

Almost surely, 2^109638431 is an apocalyptic number.

109638431 is a deficient number, since it is larger than the sum of its proper divisors (17900209).

109638431 is an equidigital number, since it uses as much as digits as its factorization.

109638431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2237533 (or 2237526 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 109638431 is about 10470.8371680587. The cubic root of 109638431 is about 478.6164310034.

The spelling of 109638431 in words is "one hundred nine million, six hundred thirty-eight thousand, four hundred thirty-one".