1211009716 has 36 divisors (see below), whose sum is σ = 2470608000. Its totient is φ = 517880496.

The previous prime is 1211009713. The next prime is 1211009717. The reversal of 1211009716 is 6179001121.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211009711) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 87435 + ... + 100333.

It is an arithmetic number, because the mean of its divisors is an integer number (68628000).

Almost surely, 2^1211009716 is an apocalyptic number.

It is an amenable number.

1211009716 is an abundant number, since it is smaller than the sum of its proper divisors (1259598284).

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

1211009716 is a wasteful number, since it uses less digits than its factorization.

1211009716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13396 (or 13387 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 28.

The square root of 1211009716 is about 34799.5648823373. The cubic root of 1211009716 is about 1065.8985608659.

It can be divided in two parts, 121100 and 9716, that added together give a triangular number (130816 = T₅₁₁).

The spelling of 1211009716 in words is "one billion, two hundred eleven million, nine thousand, seven hundred sixteen".