1001121500 has 48 divisors (see below), whose sum is σ = 2315083680. Its totient is φ = 376889600.

The previous prime is 1001121493. The next prime is 1001121503. The reversal of 1001121500 is 51211001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001121503) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50390 + ... + 67389.

It is an arithmetic number, because the mean of its divisors is an integer number (48230910).

Almost surely, 2^1001121500 is an apocalyptic number.

1001121500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1001121500 is an abundant number, since it is smaller than the sum of its proper divisors (1313962180).

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

1001121500 is a wasteful number, since it uses less digits than its factorization.

1001121500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117815 (or 117803 counting only the distinct ones).

The product of its (nonzero) digits is 10, while the sum is 11.

The square root of 1001121500 is about 31640.5041047073. The cubic root of 1001121500 is about 1000.3736936690.

Adding to 1001121500 its reverse (51211001), we get a palindrome (1052332501).

The spelling of 1001121500 in words is "one billion, one million, one hundred twenty-one thousand, five hundred".