40431109 has 2 divisors, whose sum is σ = 40431110. Its totient is φ = 40431108.

The previous prime is 40431089. The next prime is 40431113. The reversal of 40431109 is 90113404.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30802500 + 9628609 = 5550^2 + 3103^2 .

It is a cyclic number.

It is not a de Polignac number, because 40431109 - 2⁹ = 40430597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40431109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40431119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20215554 + 20215555.

It is an arithmetic number, because the mean of its divisors is an integer number (20215555).

Almost surely, 2^40431109 is an apocalyptic number.

It is an amenable number.

40431109 is a deficient number, since it is larger than the sum of its proper divisors (1).

40431109 is an equidigital number, since it uses as much as digits as its factorization.

40431109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 40431109 is about 6358.5461388591. The cubic root of 40431109 is about 343.2194449501.

It can be divided in two parts, 404 and 31109, that added together give a palindrome (31513).

The spelling of 40431109 in words is "forty million, four hundred thirty-one thousand, one hundred nine".