1287297069 has 16 divisors (see below), whose sum is σ = 1826790912. Its totient is φ = 803524608.

The previous prime is 1287297059. The next prime is 1287297113. The reversal of 1287297069 is 9607927821.

It is not a de Polignac number, because 1287297069 - 2¹² = 1287292973 is a prime.

It is a super-2 number, since 2×1287297069² = 3314267487711981522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1287297029) 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, 55549 + ... + 75234.

It is an arithmetic number, because the mean of its divisors is an integer number (114174432).

Almost surely, 2^1287297069 is an apocalyptic number.

It is an amenable number.

1287297069 is a deficient number, since it is larger than the sum of its proper divisors (539493843).

1287297069 is a wasteful number, since it uses less digits than its factorization.

1287297069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130996.

The product of its (nonzero) digits is 762048, while the sum is 51.

The square root of 1287297069 is about 35878.9223500372. The cubic root of 1287297069 is about 1087.8263978912.

The spelling of 1287297069 in words is "one billion, two hundred eighty-seven million, two hundred ninety-seven thousand, sixty-nine".