1321487 has 2 divisors, whose sum is σ = 1321488. Its totient is φ = 1321486.

The previous prime is 1321483. The next prime is 1321513. The reversal of 1321487 is 7841231.

It is an a-pointer prime, because the next prime (1321513) can be obtained adding 1321487 to its sum of digits (26).

It is a weak prime.

It is an emirp because it is prime and its reverse (7841231) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1321487 - 2² = 1321483 is a prime.

It is a Chen prime.

It is a zygodrome in base 4.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1321483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660743 + 660744.

It is an arithmetic number, because the mean of its divisors is an integer number (660744).

2^1321487 is an apocalyptic number.

1321487 is a deficient number, since it is larger than the sum of its proper divisors (1).

1321487 is an equidigital number, since it uses as much as digits as its factorization.

1321487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 1321487 is about 1149.5594808447. The cubic root of 1321487 is about 109.7373070420.

The spelling of 1321487 in words is "one million, three hundred twenty-one thousand, four hundred eighty-seven".