1011211992 has 64 divisors (see below), whose sum is σ = 3210201600. Its totient is φ = 288917280.

The previous prime is 1011211979. The next prime is 1011212011. The reversal of 1011211992 is 2991121101.

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 (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332884 + ... + 335907.

It is an arithmetic number, because the mean of its divisors is an integer number (50159400).

Almost surely, 2^1011211992 is an apocalyptic number.

1011211992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1011211992 is an abundant number, since it is smaller than the sum of its proper divisors (2198989608).

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

1011211992 is a wasteful number, since it uses less digits than its factorization.

1011211992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668813 (or 668803 counting only the distinct ones).

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

The square root of 1011211992 is about 31799.5596195922. The cubic root of 1011211992 is about 1003.7234493840.

The spelling of 1011211992 in words is "one billion, eleven million, two hundred eleven thousand, nine hundred ninety-two".