1581650916 has 12 divisors (see below), whose sum is σ = 3690518832. Its totient is φ = 527216968.

The previous prime is 1581650911. The next prime is 1581650921. The reversal of 1581650916 is 6190561851.

It is an interprime number because it is at equal distance from previous prime (1581650911) and next prime (1581650921).

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1581650911) 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, 65902110 + ... + 65902133.

It is an arithmetic number, because the mean of its divisors is an integer number (307543236).

Almost surely, 2^1581650916 is an apocalyptic number.

It is an amenable number.

1581650916 is an abundant number, since it is smaller than the sum of its proper divisors (2108867916).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1581650916 is a wasteful number, since it uses less digits than its factorization.

1581650916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131804250 (or 131804248 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 42.

The square root of 1581650916 is about 39769.9750565675. The cubic root of 1581650916 is about 1165.1188065517.

The spelling of 1581650916 in words is "one billion, five hundred eighty-one million, six hundred fifty thousand, nine hundred sixteen".