1987231 has 2 divisors, whose sum is σ = 1987232. Its totient is φ = 1987230.

The previous prime is 1987217. The next prime is 1987241. The reversal of 1987231 is 1327891.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1987231 - 2¹¹ = 1985183 is a prime.

It is a super-2 number, since 2×1987231² = 7898174094722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1987193 and 1987202.

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, 993615 + 993616.

It is an arithmetic number, because the mean of its divisors is an integer number (993616).

2^1987231 is an apocalyptic number.

1987231 is a deficient number, since it is larger than the sum of its proper divisors (1).

1987231 is an equidigital number, since it uses as much as digits as its factorization.

1987231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1987231 is about 1409.6918102905. The cubic root of 1987231 is about 125.7234001287.

The spelling of 1987231 in words is "one million, nine hundred eighty-seven thousand, two hundred thirty-one".