1118392921 has 4 divisors (see below), whose sum is σ = 1154470144. Its totient is φ = 1082315700.

The previous prime is 1118392901. The next prime is 1118392931. The reversal of 1118392921 is 1292938111.

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 1118392921 - 2¹⁷ = 1118261849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1118392901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18038565 + ... + 18038626.

It is an arithmetic number, because the mean of its divisors is an integer number (288617536).

Almost surely, 2^1118392921 is an apocalyptic number.

It is an amenable number.

1118392921 is a deficient number, since it is larger than the sum of its proper divisors (36077223).

1118392921 is an equidigital number, since it uses as much as digits as its factorization.

1118392921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36077222.

The product of its digits is 7776, while the sum is 37.

The square root of 1118392921 is about 33442.3821071406. The cubic root of 1118392921 is about 1038.0018714009.

The spelling of 1118392921 in words is "one billion, one hundred eighteen million, three hundred ninety-two thousand, nine hundred twenty-one".