982221661 has 2 divisors, whose sum is σ = 982221662. Its totient is φ = 982221660.

The previous prime is 982221649. The next prime is 982221679. The reversal of 982221661 is 166122289.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 919969561 + 62252100 = 30331^2 + 7890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-982221661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 982221661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (982221641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 491110830 + 491110831.

It is an arithmetic number, because the mean of its divisors is an integer number (491110831).

Almost surely, 2^982221661 is an apocalyptic number.

It is an amenable number.

982221661 is a deficient number, since it is larger than the sum of its proper divisors (1).

982221661 is an equidigital number, since it uses as much as digits as its factorization.

982221661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 982221661 is about 31340.4157757998. The cubic root of 982221661 is about 994.0384171558.

The spelling of 982221661 in words is "nine hundred eighty-two million, two hundred twenty-one thousand, six hundred sixty-one".