1009911956 has 12 divisors (see below), whose sum is σ = 1767911040. Its totient is φ = 504794520.

The previous prime is 1009911949. The next prime is 1009911967. The reversal of 1009911956 is 6591199001.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25700 + ... + 51771.

It is an arithmetic number, because the mean of its divisors is an integer number (147325920).

Almost surely, 2^1009911956 is an apocalyptic number.

It is an amenable number.

1009911956 is a deficient number, since it is larger than the sum of its proper divisors (757999084).

1009911956 is a wasteful number, since it uses less digits than its factorization.

1009911956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80734 (or 80732 counting only the distinct ones).

The product of its (nonzero) digits is 21870, while the sum is 41.

The square root of 1009911956 is about 31779.1119447980. Note that the first 3 decimals coincide. The cubic root of 1009911956 is about 1003.2931287322.

The spelling of 1009911956 in words is "one billion, nine million, nine hundred eleven thousand, nine hundred fifty-six".