1983755221 has 8 divisors (see below), whose sum is σ = 2365720704. Its totient is φ = 1626432720.

The previous prime is 1983755203. The next prime is 1983755233. The reversal of 1983755221 is 1225573891.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1983755221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1983755261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6160570 + ... + 6160891.

It is an arithmetic number, because the mean of its divisors is an integer number (295715088).

Almost surely, 2^1983755221 is an apocalyptic number.

It is an amenable number.

1983755221 is a deficient number, since it is larger than the sum of its proper divisors (381965483).

1983755221 is a wasteful number, since it uses less digits than its factorization.

1983755221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12321491.

The product of its digits is 151200, while the sum is 43.

The square root of 1983755221 is about 44539.3670924947. The cubic root of 1983755221 is about 1256.5005824861.

The spelling of 1983755221 in words is "one billion, nine hundred eighty-three million, seven hundred fifty-five thousand, two hundred twenty-one".