1287448161 has 16 divisors (see below), whose sum is σ = 1792751616. Its totient is φ = 820285136.

The previous prime is 1287448157. The next prime is 1287448171. The reversal of 1287448161 is 1618447821.

1287448161 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 1287448161 - 2² = 1287448157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1287448121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81256 + ... + 95798.

It is an arithmetic number, because the mean of its divisors is an integer number (112046976).

Almost surely, 2^1287448161 is an apocalyptic number.

It is an amenable number.

1287448161 is a deficient number, since it is larger than the sum of its proper divisors (505303455).

1287448161 is a wasteful number, since it uses less digits than its factorization.

1287448161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15852.

The product of its digits is 86016, while the sum is 42.

The square root of 1287448161 is about 35881.0278698925. The cubic root of 1287448161 is about 1087.8689561682.

The spelling of 1287448161 in words is "one billion, two hundred eighty-seven million, four hundred forty-eight thousand, one hundred sixty-one".