1001255120 has 80 divisors (see below), whose sum is σ = 2471748048. Its totient is φ = 375889920.

The previous prime is 1001255111. The next prime is 1001255161. The reversal of 1001255120 is 215521001.

It can be written as a sum of positive squares in 8 ways, for example, as 30558784 + 970696336 = 5528^2 + 31156^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (17).

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, 626162 + ... + 627758.

Almost surely, 2^1001255120 is an apocalyptic number.

1001255120 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 1001255120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235874024).

1001255120 is an abundant number, since it is smaller than the sum of its proper divisors (1470492928).

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

1001255120 is a wasteful number, since it uses less digits than its factorization.

1001255120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2088 (or 2082 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 17.

The square root of 1001255120 is about 31642.6155682491. The cubic root of 1001255120 is about 1000.4181984190.

Adding to 1001255120 its reverse (215521001), we get a palindrome (1216776121).

The spelling of 1001255120 in words is "one billion, one million, two hundred fifty-five thousand, one hundred twenty".