983811661 has 24 divisors (see below), whose sum is σ = 1172365056. Its totient is φ = 822800160.

The previous prime is 983811643. The next prime is 983811671. The reversal of 983811661 is 166118389.

It is a happy number.

It is not a de Polignac number, because 983811661 - 2⁹ = 983811149 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 (983811601) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1452855 + ... + 1453531.

It is an arithmetic number, because the mean of its divisors is an integer number (48848544).

Almost surely, 2^983811661 is an apocalyptic number.

It is an amenable number.

983811661 is a deficient number, since it is larger than the sum of its proper divisors (188553395).

983811661 is a wasteful number, since it uses less digits than its factorization.

983811661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369 (or 1362 counting only the distinct ones).

The product of its digits is 62208, while the sum is 43.

The square root of 983811661 is about 31365.7721250410. The cubic root of 983811661 is about 994.5745042306.

The spelling of 983811661 in words is "nine hundred eighty-three million, eight hundred eleven thousand, six hundred sixty-one".