1318404961 has 4 divisors (see below), whose sum is σ = 1395958212. Its totient is φ = 1240851712.

The previous prime is 1318404959. The next prime is 1318404991. The reversal of 1318404961 is 1694048131.

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 1123523361 + 194881600 = 33519^2 + 13960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318404961 - 2¹ = 1318404959 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1318404961.

It is not an unprimeable number, because it can be changed into a prime (1318404911) 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, 38776600 + ... + 38776633.

It is an arithmetic number, because the mean of its divisors is an integer number (348989553).

Almost surely, 2^1318404961 is an apocalyptic number.

It is an amenable number.

1318404961 is a deficient number, since it is larger than the sum of its proper divisors (77553251).

1318404961 is an equidigital number, since it uses as much as digits as its factorization.

1318404961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77553250.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 1318404961 is about 36309.8466121795. The cubic root of 1318404961 is about 1096.5192899559.

The spelling of 1318404961 in words is "one billion, three hundred eighteen million, four hundred four thousand, nine hundred sixty-one".