1276981 has 4 divisors (see below), whose sum is σ = 1311532. Its totient is φ = 1242432.

The previous prime is 1276973. The next prime is 1276987. The reversal of 1276981 is 1896721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1136356 + 140625 = 1066^2 + 375^2 .

It is a cyclic number.

It is not a de Polignac number, because 1276981 - 2³ = 1276973 is a prime.

It is a super-2 number, since 2×1276981² = 3261360948722, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1276987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17220 + ... + 17293.

It is an arithmetic number, because the mean of its divisors is an integer number (327883).

2^1276981 is an apocalyptic number.

It is an amenable number.

1276981 is a deficient number, since it is larger than the sum of its proper divisors (34551).

1276981 is an equidigital number, since it uses as much as digits as its factorization.

1276981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34550.

The product of its digits is 6048, while the sum is 34.

The square root of 1276981 is about 1130.0358401396. The cubic root of 1276981 is about 108.4912746847.

It can be divided in two parts, 12769 and 81, that multiplied together give a square (1034289 = 1017²).

The spelling of 1276981 in words is "one million, two hundred seventy-six thousand, nine hundred eighty-one".