1008909431 has 4 divisors (see below), whose sum is σ = 1027945512. Its totient is φ = 989873352.

The previous prime is 1008909413. The next prime is 1008909437. The reversal of 1008909431 is 1349098001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1008909431 - 2¹⁸ = 1008647287 is a prime.

It is a super-2 number, since 2×1008909431² = 2035796479921487522, 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 = 1008909391 and 1008909400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1008909437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9517961 + ... + 9518066.

It is an arithmetic number, because the mean of its divisors is an integer number (256986378).

Almost surely, 2^1008909431 is an apocalyptic number.

1008909431 is a deficient number, since it is larger than the sum of its proper divisors (19036081).

1008909431 is an equidigital number, since it uses as much as digits as its factorization.

1008909431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19036080.

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1008909431 is about 31763.3346958407. The cubic root of 1008909431 is about 1002.9610339574.

The spelling of 1008909431 in words is "one billion, eight million, nine hundred nine thousand, four hundred thirty-one".