1273981 has 2 divisors, whose sum is σ = 1273982. Its totient is φ = 1273980.

The previous prime is 1273957. The next prime is 1274011. The reversal of 1273981 is 1893721.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1229881 + 44100 = 1109^2 + 210^2 .

It is a cyclic number.

It is not a de Polignac number, because 1273981 - 2¹⁷ = 1142909 is a prime.

It is a super-2 number, since 2×1273981² = 3246055176722, which contains 22 as substring.

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 (1273381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 636990 + 636991.

It is an arithmetic number, because the mean of its divisors is an integer number (636991).

2^1273981 is an apocalyptic number.

It is an amenable number.

1273981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1273981 is an equidigital number, since it uses as much as digits as its factorization.

1273981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 31.

The square root of 1273981 is about 1128.7076680877. The cubic root of 1273981 is about 108.4062488738.

The spelling of 1273981 in words is "one million, two hundred seventy-three thousand, nine hundred eighty-one".