1009881656 has 16 divisors (see below), whose sum is σ = 2164032240. Its totient is φ = 432806400.

The previous prime is 1009881643. The next prime is 1009881671. The reversal of 1009881656 is 6561889001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9016745 + ... + 9016856.

It is an arithmetic number, because the mean of its divisors is an integer number (135252015).

Almost surely, 2^1009881656 is an apocalyptic number.

It is an amenable number.

1009881656 is an abundant number, since it is smaller than the sum of its proper divisors (1154150584).

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

1009881656 is a wasteful number, since it uses less digits than its factorization.

1009881656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18033614 (or 18033610 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 1009881656 is about 31778.6352129855. The cubic root of 1009881656 is about 1003.2830948259.

The spelling of 1009881656 in words is "one billion, nine million, eight hundred eighty-one thousand, six hundred fifty-six".