1247881 has 2 divisors, whose sum is σ = 1247882. Its totient is φ = 1247880.

The previous prime is 1247879. The next prime is 1247893. The reversal of 1247881 is 1887421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 57600 = 1091^2 + 240^2 .

It is an emirp because it is prime and its reverse (1887421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1247881 - 2¹ = 1247879 is a prime.

It is a super-2 number, since 2×1247881² = 3114413980322, which contains 22 as substring.

Together with 1247879, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1247801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623940 + 623941.

It is an arithmetic number, because the mean of its divisors is an integer number (623941).

2^1247881 is an apocalyptic number.

It is an amenable number.

1247881 is a deficient number, since it is larger than the sum of its proper divisors (1).

1247881 is an equidigital number, since it uses as much as digits as its factorization.

1247881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3584, while the sum is 31.

The square root of 1247881 is about 1117.0859411881. The cubic root of 1247881 is about 107.6608301121.

The spelling of 1247881 in words is "one million, two hundred forty-seven thousand, eight hundred eighty-one".