1293681287 has 4 divisors (see below), whose sum is σ = 1293759096. Its totient is φ = 1293603480.

The previous prime is 1293681211. The next prime is 1293681313. The reversal of 1293681287 is 7821863921.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1293681287 - 2²⁴ = 1276904071 is a prime.

It is a super-2 number, since 2×1293681287² = 3347222544667952738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1293681887) 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, 2789 + ... + 50942.

It is an arithmetic number, because the mean of its divisors is an integer number (323439774).

Almost surely, 2^1293681287 is an apocalyptic number.

1293681287 is a deficient number, since it is larger than the sum of its proper divisors (77809).

1293681287 is an equidigital number, since it uses as much as digits as its factorization.

1293681287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77808.

The product of its digits is 290304, while the sum is 47.

The square root of 1293681287 is about 35967.7812354335. The cubic root of 1293681287 is about 1089.6217544023.

The spelling of 1293681287 in words is "one billion, two hundred ninety-three million, six hundred eighty-one thousand, two hundred eighty-seven".