1121987 has 2 divisors, whose sum is σ = 1121988. Its totient is φ = 1121986.

The previous prime is 1121947. The next prime is 1121993. The reversal of 1121987 is 7891211.

It is a strong prime.

It is an emirp because it is prime and its reverse (7891211) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1121987 - 2¹⁴ = 1105603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1121947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 560993 + 560994.

It is an arithmetic number, because the mean of its divisors is an integer number (560994).

2^1121987 is an apocalyptic number.

1121987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1121987 is an equidigital number, since it uses as much as digits as its factorization.

1121987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1008, while the sum is 29.

The square root of 1121987 is about 1059.2388776853. The cubic root of 1121987 is about 103.9112593605.

The spelling of 1121987 in words is "one million, one hundred twenty-one thousand, nine hundred eighty-seven".