1287253287 has 12 divisors (see below), whose sum is σ = 1957227480. Its totient is φ = 813001968.

The previous prime is 1287253271. The next prime is 1287253301. The reversal of 1287253287 is 7823527821.

It is not a de Polignac number, because 1287253287 - 2⁴ = 1287253271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287253087) 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, 3763728 + ... + 3764069.

It is an arithmetic number, because the mean of its divisors is an integer number (163102290).

Almost surely, 2^1287253287 is an apocalyptic number.

1287253287 is a deficient number, since it is larger than the sum of its proper divisors (669974193).

1287253287 is a wasteful number, since it uses less digits than its factorization.

1287253287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7527822 (or 7527819 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 1287253287 is about 35878.3122094672. The cubic root of 1287253287 is about 1087.8140651369.

The spelling of 1287253287 in words is "one billion, two hundred eighty-seven million, two hundred fifty-three thousand, two hundred eighty-seven".