1987101 has 6 divisors (see below), whose sum is σ = 2870270. Its totient is φ = 1324728.

The previous prime is 1987099. The next prime is 1987121. The reversal of 1987101 is 1017891.

It can be written as a sum of positive squares in only one way, i.e., 1887876 + 99225 = 1374^2 + 315^2 .

It is not a de Polignac number, because 1987101 - 2¹ = 1987099 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 (1987121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 110386 + ... + 110403.

2^1987101 is an apocalyptic number.

It is an amenable number.

1987101 is a deficient number, since it is larger than the sum of its proper divisors (883169).

1987101 is a wasteful number, since it uses less digits than its factorization.

1987101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220795 (or 220792 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 1987101 is about 1409.6457001672. The cubic root of 1987101 is about 125.7206585588.

The spelling of 1987101 in words is "one million, nine hundred eighty-seven thousand, one hundred one".