1281331377 has 12 divisors (see below), whose sum is σ = 1851164484. Its totient is φ = 854058240.

The previous prime is 1281331369. The next prime is 1281331409. The reversal of 1281331377 is 7731331821.

1281331377 is a `hidden beast` number, since 1 + 281 + 3 + 3 + 1 + 377 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 310323456 + 971007921 = 17616^2 + 31161^2 .

It is not a de Polignac number, because 1281331377 - 2³ = 1281331369 is a prime.

It is a super-2 number, since 2×1281331377² = 3283620195369432258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1281330377) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 54093 + ... + 74085.

It is an arithmetic number, because the mean of its divisors is an integer number (154263707).

Almost surely, 2^1281331377 is an apocalyptic number.

It is an amenable number.

1281331377 is a deficient number, since it is larger than the sum of its proper divisors (569833107).

1281331377 is a wasteful number, since it uses less digits than its factorization.

1281331377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27120 (or 27117 counting only the distinct ones).

The product of its digits is 21168, while the sum is 36.

The square root of 1281331377 is about 35795.6893633856. The cubic root of 1281331377 is about 1086.1433654835.

The spelling of 1281331377 in words is "one billion, two hundred eighty-one million, three hundred thirty-one thousand, three hundred seventy-seven".