1318877921 has 8 divisors (see below), whose sum is σ = 1366579200. Its totient is φ = 1271324880.

The previous prime is 1318877887. The next prime is 1318877953. The reversal of 1318877921 is 1297788131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1318877921 - 2¹⁸ = 1318615777 is a prime.

It is a super-3 number, since 3×1318877921³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1318873921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18785 + ... + 54686.

It is an arithmetic number, because the mean of its divisors is an integer number (170822400).

Almost surely, 2^1318877921 is an apocalyptic number.

It is an amenable number.

1318877921 is a deficient number, since it is larger than the sum of its proper divisors (47701279).

1318877921 is an equidigital number, since it uses as much as digits as its factorization.

1318877921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74119.

The product of its digits is 169344, while the sum is 47.

The square root of 1318877921 is about 36316.3588620886. The cubic root of 1318877921 is about 1096.6503947824.

The spelling of 1318877921 in words is "one billion, three hundred eighteen million, eight hundred seventy-seven thousand, nine hundred twenty-one".