1988101 has 2 divisors, whose sum is σ = 1988102. Its totient is φ = 1988100.

The previous prime is 1988089. The next prime is 1988113. The reversal of 1988101 is 1018891.

It is a Cunningham number, because it is equal to 1410²+1.

It is a balanced prime because it is at equal distance from previous prime (1988089) and next prime (1988113).

It can be written as a sum of positive squares in only one way, i.e., 1988100 + 1 = 1410^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 1988101 - 2¹¹ = 1986053 is a prime.

1988101 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1988101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1988801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 994050 + 994051.

It is an arithmetic number, because the mean of its divisors is an integer number (994051).

2^1988101 is an apocalyptic number.

It is an amenable number.

1988101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1988101 is an equidigital number, since it uses as much as digits as its factorization.

1988101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 28.

The square root of 1988101 is about 1410.0003546099. Note that the first 3 decimals coincide. The cubic root of 1988101 is about 125.7417444816.

The spelling of 1988101 in words is "one million, nine hundred eighty-eight thousand, one hundred one".