1581656052 has 24 divisors (see below), whose sum is σ = 3726364096. Its totient is φ = 522099648.

The previous prime is 1581656029. The next prime is 1581656059. The reversal of 1581656052 is 2506561851.

It is a self number, because there is not a number n which added to its sum of digits gives 1581656052.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1581656059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 638593 + ... + 641064.

Almost surely, 2^1581656052 is an apocalyptic number.

1581656052 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1581656052 is an abundant number, since it is smaller than the sum of its proper divisors (2144708044).

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

1581656052 is a wasteful number, since it uses less digits than its factorization.

1581656052 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279767 (or 1279765 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 39.

The square root of 1581656052 is about 39770.0396278405. The cubic root of 1581656052 is about 1165.1200676904.

The spelling of 1581656052 in words is "one billion, five hundred eighty-one million, six hundred fifty-six thousand, fifty-two".