1581408009 has 16 divisors (see below), whose sum is σ = 2406147840. Its totient is φ = 1025777520.

The previous prime is 1581408001. The next prime is 1581408029. The reversal of 1581408009 is 9008041851.

It is not a de Polignac number, because 1581408009 - 2³ = 1581408001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1581408001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 790497 + ... + 792494.

It is an arithmetic number, because the mean of its divisors is an integer number (150384240).

Almost surely, 2^1581408009 is an apocalyptic number.

It is an amenable number.

1581408009 is a deficient number, since it is larger than the sum of its proper divisors (824739831).

1581408009 is a wasteful number, since it uses less digits than its factorization.

1581408009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583037 (or 1583031 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 36.

The square root of 1581408009 is about 39766.9210399799. The cubic root of 1581408009 is about 1165.0591579064.

The spelling of 1581408009 in words is "one billion, five hundred eighty-one million, four hundred eight thousand, nine".