1275976981 has 2 divisors, whose sum is σ = 1275976982. Its totient is φ = 1275976980.

The previous prime is 1275976967. The next prime is 1275977023. The reversal of 1275976981 is 1896795721.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 878173956 + 397803025 = 29634^2 + 19945^2 .

It is a cyclic number.

It is not a de Polignac number, because 1275976981 - 2⁷ = 1275976853 is a prime.

It is a super-2 number, since 2×1275976981² = 3256234512083748722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1275976081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 637988490 + 637988491.

It is an arithmetic number, because the mean of its divisors is an integer number (637988491).

Almost surely, 2^1275976981 is an apocalyptic number.

It is an amenable number.

1275976981 is a deficient number, since it is larger than the sum of its proper divisors (1).

1275976981 is an equidigital number, since it uses as much as digits as its factorization.

1275976981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 55.

The square root of 1275976981 is about 35720.8199933876. The cubic root of 1275976981 is about 1084.6283368166.

The spelling of 1275976981 in words is "one billion, two hundred seventy-five million, nine hundred seventy-six thousand, nine hundred eighty-one".