109431 has 20 divisors (see below), whose sum is σ = 187792. Its totient is φ = 62208.

The previous prime is 109423. The next prime is 109433. The reversal of 109431 is 134901.

It is not a de Polignac number, because 109431 - 2³ = 109423 is a prime.

It is a super-2 number, since 2×109431² = 23950287522, which contains 22 as substring.

It is a Duffinian number.

109431 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (109433) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 471 + ... + 663.

2¹⁰⁹⁴³¹ is an apocalyptic number.

109431 is a deficient number, since it is larger than the sum of its proper divisors (78361).

109431 is an equidigital number, since it uses as much as digits as its factorization.

109431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212 (or 203 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

The square root of 109431 is about 330.8035670908. The cubic root of 109431 is about 47.8314400165.

The spelling of 109431 in words is "one hundred nine thousand, four hundred thirty-one".