1312187 has 2 divisors, whose sum is σ = 1312188. Its totient is φ = 1312186.

The previous prime is 1312183. The next prime is 1312189. The reversal of 1312187 is 7812131.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1312187 - 2² = 1312183 is a prime.

Together with 1312189, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1312183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 656093 + 656094.

It is an arithmetic number, because the mean of its divisors is an integer number (656094).

2^1312187 is an apocalyptic number.

1312187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1312187 is an equidigital number, since it uses as much as digits as its factorization.

1312187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 23.

The square root of 1312187 is about 1145.5073111945. The cubic root of 1312187 is about 109.4792743799.

The spelling of 1312187 in words is "one million, three hundred twelve thousand, one hundred eighty-seven".