1281445155 has 12 divisors (see below), whose sum is σ = 2221171680. Its totient is φ = 683437392.

The previous prime is 1281445153. The next prime is 1281445157. The reversal of 1281445155 is 5515441821.

1281445155 is a `hidden beast` number, since 128 + 14 + 4 + 515 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (1281445153) and next prime (1281445157).

It is not a de Polignac number, because 1281445155 - 2¹ = 1281445153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1281445153) 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 11 ways as a sum of consecutive naturals, for example, 14238235 + ... + 14238324.

It is an arithmetic number, because the mean of its divisors is an integer number (185097640).

Almost surely, 2^1281445155 is an apocalyptic number.

1281445155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1281445155 is a deficient number, since it is larger than the sum of its proper divisors (939726525).

1281445155 is a wasteful number, since it uses less digits than its factorization.

1281445155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28476570 (or 28476567 counting only the distinct ones).

The product of its digits is 32000, while the sum is 36.

The square root of 1281445155 is about 35797.2785976811. The cubic root of 1281445155 is about 1086.1755131814.

Adding to 1281445155 its reverse (5515441821), we get a palindrome (6796886976).

The spelling of 1281445155 in words is "one billion, two hundred eighty-one million, four hundred forty-five thousand, one hundred fifty-five".