1121191000 has 32 divisors (see below), whose sum is σ = 2623589280. Its totient is φ = 448476000.

The previous prime is 1121190997. The next prime is 1121191009. The reversal of 1121191000 is 1911211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121191009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 559596 + ... + 561595.

It is an arithmetic number, because the mean of its divisors is an integer number (81987165).

Almost surely, 2^1121191000 is an apocalyptic number.

1121191000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121191000 is an abundant number, since it is smaller than the sum of its proper divisors (1502398280).

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

1121191000 is a wasteful number, since it uses less digits than its factorization.

1121191000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121212 (or 1121198 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 16.

The square root of 1121191000 is about 33484.1902993039. The cubic root of 1121191000 is about 1038.8668007077.

The spelling of 1121191000 in words is "one billion, one hundred twenty-one million, one hundred ninety-one thousand".