283981661 has 4 divisors (see below), whose sum is σ = 290023872. Its totient is φ = 277939452.

The previous prime is 283981603. The next prime is 283981673. The reversal of 283981661 is 166189382.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-283981661 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 (283981561) 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 3 ways as a sum of consecutive naturals, for example, 3021035 + ... + 3021128.

It is an arithmetic number, because the mean of its divisors is an integer number (72505968).

Almost surely, 2^283981661 is an apocalyptic number.

It is an amenable number.

283981661 is a deficient number, since it is larger than the sum of its proper divisors (6042211).

283981661 is an equidigital number, since it uses as much as digits as its factorization.

283981661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6042210.

The product of its digits is 124416, while the sum is 44.

The square root of 283981661 is about 16851.7554278479. The cubic root of 283981661 is about 657.2996963906.

The spelling of 283981661 in words is "two hundred eighty-three million, nine hundred eighty-one thousand, six hundred sixty-one".