1118075821 has 2 divisors, whose sum is σ = 1118075822. Its totient is φ = 1118075820.

The previous prime is 1118075813. The next prime is 1118075851. The reversal of 1118075821 is 1285708111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1021761225 + 96314596 = 31965^2 + 9814^2 .

It is an emirp because it is prime and its reverse (1285708111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1118075821 - 2³ = 1118075813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1118075851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 559037910 + 559037911.

It is an arithmetic number, because the mean of its divisors is an integer number (559037911).

Almost surely, 2^1118075821 is an apocalyptic number.

It is an amenable number.

1118075821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1118075821 is an equidigital number, since it uses as much as digits as its factorization.

1118075821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4480, while the sum is 34.

The square root of 1118075821 is about 33437.6407810120. The cubic root of 1118075821 is about 1037.9037599351.

The spelling of 1118075821 in words is "one billion, one hundred eighteen million, seventy-five thousand, eight hundred twenty-one".