1018212091 has 4 divisors (see below), whose sum is σ = 1096536112. Its totient is φ = 939888072.

The previous prime is 1018212079. The next prime is 1018212131. The reversal of 1018212091 is 1902128101.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1018212091 - 2⁷ = 1018211963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1018212031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39161991 + ... + 39162016.

It is an arithmetic number, because the mean of its divisors is an integer number (274134028).

Almost surely, 2^1018212091 is an apocalyptic number.

1018212091 is a deficient number, since it is larger than the sum of its proper divisors (78324021).

1018212091 is an equidigital number, since it uses as much as digits as its factorization.

1018212091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78324020.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 1018212091 is about 31909.4357674967. The cubic root of 1018212091 is about 1006.0342120463.

The spelling of 1018212091 in words is "one billion, eighteen million, two hundred twelve thousand, ninety-one".