1581359948 has 18 divisors (see below), whose sum is σ = 3219197436. Its totient is φ = 677725608.

The previous prime is 1581359939. The next prime is 1581359951. The reversal of 1581359948 is 8499531851.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1581359948.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4033886 + ... + 4034277.

It is an arithmetic number, because the mean of its divisors is an integer number (178844302).

Almost surely, 2^1581359948 is an apocalyptic number.

It is an amenable number.

1581359948 is an abundant number, since it is smaller than the sum of its proper divisors (1637837488).

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

1581359948 is a wasteful number, since it uses less digits than its factorization.

1581359948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8068181 (or 8068172 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 53.

The square root of 1581359948 is about 39766.3167517436. The cubic root of 1581359948 is about 1165.0473552438.

The spelling of 1581359948 in words is "one billion, five hundred eighty-one million, three hundred fifty-nine thousand, nine hundred forty-eight".