1581230915 has 16 divisors (see below), whose sum is σ = 2085785856. Its totient is φ = 1141202400.

The previous prime is 1581230909. The next prime is 1581230947. The reversal of 1581230915 is 5190321851.

It is not a de Polignac number, because 1581230915 - 2¹² = 1581226819 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 102527 + ... + 116936.

It is an arithmetic number, because the mean of its divisors is an integer number (130361616).

Almost surely, 2^1581230915 is an apocalyptic number.

1581230915 is a deficient number, since it is larger than the sum of its proper divisors (504554941).

1581230915 is a wasteful number, since it uses less digits than its factorization.

1581230915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219610.

The product of its (nonzero) digits is 10800, while the sum is 35.

The square root of 1581230915 is about 39764.6943280091. The cubic root of 1581230915 is about 1165.0156665604.

The spelling of 1581230915 in words is "one billion, five hundred eighty-one million, two hundred thirty thousand, nine hundred fifteen".