1983216261 has 16 divisors (see below), whose sum is σ = 2849595840. Its totient is φ = 1219626240.

The previous prime is 1983216259. The next prime is 1983216271. The reversal of 1983216261 is 1626123891.

It is not a de Polignac number, because 1983216261 - 2¹ = 1983216259 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983216241) 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 15 ways as a sum of consecutive naturals, for example, 45085 + ... + 77453.

It is an arithmetic number, because the mean of its divisors is an integer number (178099740).

Almost surely, 2^1983216261 is an apocalyptic number.

It is an amenable number.

1983216261 is a deficient number, since it is larger than the sum of its proper divisors (866379579).

1983216261 is a wasteful number, since it uses less digits than its factorization.

1983216261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33956.

The product of its digits is 31104, while the sum is 39.

The square root of 1983216261 is about 44533.3163036395. The cubic root of 1983216261 is about 1256.3867806613.

The spelling of 1983216261 in words is "one billion, nine hundred eighty-three million, two hundred sixteen thousand, two hundred sixty-one".