1318764021 has 4 divisors (see below), whose sum is σ = 1758352032. Its totient is φ = 879176012.

The previous prime is 1318764017. The next prime is 1318764049. The reversal of 1318764021 is 1204678131.

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 1318764021 - 2² = 1318764017 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318764061) 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, 219794001 + ... + 219794006.

It is an arithmetic number, because the mean of its divisors is an integer number (439588008).

Almost surely, 2^1318764021 is an apocalyptic number.

It is an amenable number.

1318764021 is a deficient number, since it is larger than the sum of its proper divisors (439588011).

1318764021 is an equidigital number, since it uses as much as digits as its factorization.

1318764021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439588010.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1318764021 is about 36314.7906644111. The cubic root of 1318764021 is about 1096.6188244923.

The spelling of 1318764021 in words is "one billion, three hundred eighteen million, seven hundred sixty-four thousand, twenty-one".