1276474961 has 2 divisors, whose sum is σ = 1276474962. Its totient is φ = 1276474960.

The previous prime is 1276474943. The next prime is 1276474963. The reversal of 1276474961 is 1694746721.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 717436225 + 559038736 = 26785^2 + 23644^2 .

It is an emirp because it is prime and its reverse (1694746721) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1276474961 is a prime.

It is a Sophie Germain prime.

Together with 1276474963, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1276474963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 638237480 + 638237481.

It is an arithmetic number, because the mean of its divisors is an integer number (638237481).

Almost surely, 2^1276474961 is an apocalyptic number.

It is an amenable number.

1276474961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1276474961 is an equidigital number, since it uses as much as digits as its factorization.

1276474961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 508032, while the sum is 47.

The square root of 1276474961 is about 35727.7897581141. The cubic root of 1276474961 is about 1084.7694190297.

The spelling of 1276474961 in words is "one billion, two hundred seventy-six million, four hundred seventy-four thousand, nine hundred sixty-one".