18883661 has 2 divisors, whose sum is σ = 18883662. Its totient is φ = 18883660.

The previous prime is 18883649. The next prime is 18883673. The reversal of 18883661 is 16638881.

It is a balanced prime because it is at equal distance from previous prime (18883649) and next prime (18883673).

It can be written as a sum of positive squares in only one way, i.e., 13032100 + 5851561 = 3610^2 + 2419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18883661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18886661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9441830 + 9441831.

It is an arithmetic number, because the mean of its divisors is an integer number (9441831).

Almost surely, 2^18883661 is an apocalyptic number.

It is an amenable number.

18883661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18883661 is an equidigital number, since it uses as much as digits as its factorization.

18883661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 18883661 is about 4345.5334540192. The cubic root of 18883661 is about 266.2944193268.

The spelling of 18883661 in words is "eighteen million, eight hundred eighty-three thousand, six hundred sixty-one".