1287315097 has 4 divisors (see below), whose sum is σ = 1298707380. Its totient is φ = 1275922816.

The previous prime is 1287315079. The next prime is 1287315103. The reversal of 1287315097 is 7905137821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7750656 + 1279564441 = 2784^2 + 35771^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1287315097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1287345097) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5695972 + ... + 5696197.

It is an arithmetic number, because the mean of its divisors is an integer number (324676845).

Almost surely, 2^1287315097 is an apocalyptic number.

It is an amenable number.

1287315097 is a deficient number, since it is larger than the sum of its proper divisors (11392283).

1287315097 is a wasteful number, since it uses less digits than its factorization.

1287315097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11392282.

The product of its (nonzero) digits is 105840, while the sum is 43.

The square root of 1287315097 is about 35879.1735830133. The cubic root of 1287315097 is about 1087.8314760360.

The spelling of 1287315097 in words is "one billion, two hundred eighty-seven million, three hundred fifteen thousand, ninety-seven".