109208431 has 2 divisors, whose sum is σ = 109208432. Its totient is φ = 109208430.

The previous prime is 109208387. The next prime is 109208441. The reversal of 109208431 is 134802901.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 109208431 - 2⁷ = 109208303 is a prime.

It is a super-2 number, since 2×109208431² = 23852962802963522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 109208431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109208441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54604215 + 54604216.

It is an arithmetic number, because the mean of its divisors is an integer number (54604216).

Almost surely, 2^109208431 is an apocalyptic number.

109208431 is a deficient number, since it is larger than the sum of its proper divisors (1).

109208431 is an equidigital number, since it uses as much as digits as its factorization.

109208431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 109208431 is about 10450.2837760513. The cubic root of 109208431 is about 477.9899027996.

The spelling of 109208431 in words is "one hundred nine million, two hundred eight thousand, four hundred thirty-one".