1211011992 has 32 divisors (see below), whose sum is σ = 3363922800. Its totient is φ = 403670592.

The previous prime is 1211011951. The next prime is 1211012021. The reversal of 1211011992 is 2991101121.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2803053 + ... + 2803484.

Almost surely, 2^1211011992 is an apocalyptic number.

1211011992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1211011992 is an abundant number, since it is smaller than the sum of its proper divisors (2152910808).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1211011992 is a wasteful number, since it uses less digits than its factorization.

1211011992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5606552 (or 5606542 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The square root of 1211011992 is about 34799.5975838802. The cubic root of 1211011992 is about 1065.8992286237.

The spelling of 1211011992 in words is "one billion, two hundred eleven million, eleven thousand, nine hundred ninety-two".