1318786961 has 4 divisors (see below), whose sum is σ = 1323082992. Its totient is φ = 1314490932.

The previous prime is 1318786957. The next prime is 1318786991. The reversal of 1318786961 is 1696878131.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1318786961 - 2² = 1318786957 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1318786901) 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, 2147555 + ... + 2148168.

It is an arithmetic number, because the mean of its divisors is an integer number (330770748).

Almost surely, 2^1318786961 is an apocalyptic number.

It is an amenable number.

1318786961 is a deficient number, since it is larger than the sum of its proper divisors (4296031).

1318786961 is an equidigital number, since it uses as much as digits as its factorization.

1318786961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4296030.

The product of its digits is 435456, while the sum is 50.

The square root of 1318786961 is about 36315.1065123042. The cubic root of 1318786961 is about 1096.6251830446.

The spelling of 1318786961 in words is "one billion, three hundred eighteen million, seven hundred eighty-six thousand, nine hundred sixty-one".