1287172855 has 16 divisors (see below), whose sum is σ = 1601501184. Its totient is φ = 992103840.

The previous prime is 1287172837. The next prime is 1287172877. The reversal of 1287172855 is 5582717821.

It is not a de Polignac number, because 1287172855 - 2¹⁵ = 1287140087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16894 + ... + 53476.

It is an arithmetic number, because the mean of its divisors is an integer number (100093824).

Almost surely, 2^1287172855 is an apocalyptic number.

1287172855 is a deficient number, since it is larger than the sum of its proper divisors (314328329).

1287172855 is a wasteful number, since it uses less digits than its factorization.

1287172855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36846.

The product of its digits is 313600, while the sum is 46.

The square root of 1287172855 is about 35877.1912919615. The cubic root of 1287172855 is about 1087.7914078805.

The spelling of 1287172855 in words is "one billion, two hundred eighty-seven million, one hundred seventy-two thousand, eight hundred fifty-five".