1318090947 has 4 divisors (see below), whose sum is σ = 1757454600. Its totient is φ = 878727296.

The previous prime is 1318090909. The next prime is 1318090957. The reversal of 1318090947 is 7490908131.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1318090947 - 2¹⁰ = 1318089923 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1318090899 and 1318090908.

It is not an unprimeable number, because it can be changed into a prime (1318090957) 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, 219681822 + ... + 219681827.

It is an arithmetic number, because the mean of its divisors is an integer number (439363650).

Almost surely, 2^1318090947 is an apocalyptic number.

1318090947 is a deficient number, since it is larger than the sum of its proper divisors (439363653).

1318090947 is an equidigital number, since it uses as much as digits as its factorization.

1318090947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439363652.

The product of its (nonzero) digits is 54432, while the sum is 42.

The square root of 1318090947 is about 36305.5222659033. The cubic root of 1318090947 is about 1096.4322277460.

The spelling of 1318090947 in words is "one billion, three hundred eighteen million, ninety thousand, nine hundred forty-seven".