1276986161 has 16 divisors (see below), whose sum is σ = 1476843840. Its totient is φ = 1091258880.

The previous prime is 1276986149. The next prime is 1276986167. The reversal of 1276986161 is 1616896721.

It is a cyclic number.

It is not a de Polignac number, because 1276986161 - 2⁶ = 1276986097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1276986167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165845 + ... + 173373.

It is an arithmetic number, because the mean of its divisors is an integer number (92302740).

Almost surely, 2^1276986161 is an apocalyptic number.

1276986161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1276986161 is a deficient number, since it is larger than the sum of its proper divisors (199857679).

1276986161 is a wasteful number, since it uses less digits than its factorization.

1276986161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8464.

The product of its digits is 217728, while the sum is 47.

The square root of 1276986161 is about 35734.9431369353. The cubic root of 1276986161 is about 1084.9142084261.

The spelling of 1276986161 in words is "one billion, two hundred seventy-six million, nine hundred eighty-six thousand, one hundred sixty-one".