2009517431 has 4 divisors (see below), whose sum is σ = 2009617512. Its totient is φ = 2009417352.

The previous prime is 2009517401. The next prime is 2009517437. The reversal of 2009517431 is 1347159002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 2009517431 - 2²² = 2005323127 is a prime.

It is a super-2 number, since 2×2009517431² = 8076320610985679522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2009517437) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8336 + ... + 63941.

It is an arithmetic number, because the mean of its divisors is an integer number (502404378).

Almost surely, 2^2009517431 is an apocalyptic number.

2009517431 is a deficient number, since it is larger than the sum of its proper divisors (100081).

2009517431 is an equidigital number, since it uses as much as digits as its factorization.

2009517431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100080.

The product of its (nonzero) digits is 7560, while the sum is 32.

The square root of 2009517431 is about 44827.6413722605. The cubic root of 2009517431 is about 1261.9164233721.

The spelling of 2009517431 in words is "two billion, nine million, five hundred seventeen thousand, four hundred thirty-one".