1121291000 has 64 divisors (see below), whose sum is σ = 2634634080. Its totient is φ = 446668800.

The previous prime is 1121290993. The next prime is 1121291011. The reversal of 1121291000 is 1921211.

It is a self number, because there is not a number n which added to its sum of digits gives 1121291000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254819 + ... + 259181.

Almost surely, 2^1121291000 is an apocalyptic number.

1121291000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121291000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1317317040).

1121291000 is an abundant number, since it is smaller than the sum of its proper divisors (1513343080).

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

1121291000 is a wasteful number, since it uses less digits than its factorization.

1121291000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4641 (or 4627 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 17.

The square root of 1121291000 is about 33485.6835080307. The cubic root of 1121291000 is about 1038.8976856006.

The spelling of 1121291000 in words is "one billion, one hundred twenty-one million, two hundred ninety-one thousand".