1011211988 has 12 divisors (see below), whose sum is σ = 1779851220. Its totient is φ = 502683072.

The previous prime is 1011211979. The next prime is 1011212011. The reversal of 1011211988 is 8891121101.

It can be written as a sum of positive squares in 2 ways, for example, as 975187984 + 36024004 = 31228^2 + 6002^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 729953 + ... + 731336.

It is an arithmetic number, because the mean of its divisors is an integer number (148320935).

Almost surely, 2^1011211988 is an apocalyptic number.

It is an amenable number.

1011211988 is a deficient number, since it is larger than the sum of its proper divisors (768639232).

1011211988 is a wasteful number, since it uses less digits than its factorization.

1011211988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1461466 (or 1461464 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 32.

The square root of 1011211988 is about 31799.5595566983. The cubic root of 1011211988 is about 1003.7234480605.

The spelling of 1011211988 in words is "one billion, eleven million, two hundred eleven thousand, nine hundred eighty-eight".