1287197 has 2 divisors, whose sum is σ = 1287198. Its totient is φ = 1287196.

The previous prime is 1287179. The next prime is 1287199. The reversal of 1287197 is 7917821.

Together with previous prime (1287179) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1267876 + 19321 = 1126^2 + 139^2 .

It is an emirp because it is prime and its reverse (7917821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1287197 - 2⁶ = 1287133 is a prime.

It is a super-2 number, since 2×1287197² = 3313752233618, which contains 22 as substring.

Together with 1287199, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1287199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 643598 + 643599.

It is an arithmetic number, because the mean of its divisors is an integer number (643599).

2^1287197 is an apocalyptic number.

It is an amenable number.

1287197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1287197 is an equidigital number, since it uses as much as digits as its factorization.

1287197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7056, while the sum is 35.

The square root of 1287197 is about 1134.5470461819. The cubic root of 1287197 is about 108.7798209495.

The spelling of 1287197 in words is "one million, two hundred eighty-seven thousand, one hundred ninety-seven".