1987501 has 2 divisors, whose sum is σ = 1987502. Its totient is φ = 1987500.

The previous prime is 1987483. The next prime is 1987519. The reversal of 1987501 is 1057891.

It is a balanced prime because it is at equal distance from previous prime (1987483) and next prime (1987519).

It can be written as a sum of positive squares in only one way, i.e., 1565001 + 422500 = 1251^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 1987501 - 2⁷ = 1987373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1987201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 993750 + 993751.

It is an arithmetic number, because the mean of its divisors is an integer number (993751).

2^1987501 is an apocalyptic number.

It is an amenable number.

1987501 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987501 is an equidigital number, since it uses as much as digits as its factorization.

1987501 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 1987501 is about 1409.7875726506. The cubic root of 1987501 is about 125.7290937766.

The spelling of 1987501 in words is "one million, nine hundred eighty-seven thousand, five hundred one".