1001255121 has 8 divisors (see below), whose sum is σ = 1483340960. Its totient is φ = 667503396.

The previous prime is 1001255111. The next prime is 1001255161. The reversal of 1001255121 is 1215521001.

1001255121 is a `hidden beast` number, since 100 + 12 + 551 + 2 + 1 = 666.

It is not a de Polignac number, because 1001255121 - 2⁵ = 1001255089 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001255094 and 1001255103.

It is not an unprimeable number, because it can be changed into a prime (1001255111) 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, 18541735 + ... + 18541788.

It is an arithmetic number, because the mean of its divisors is an integer number (185417620).

Almost surely, 2^1001255121 is an apocalyptic number.

It is an amenable number.

1001255121 is a deficient number, since it is larger than the sum of its proper divisors (482085839).

1001255121 is an equidigital number, since it uses as much as digits as its factorization.

1001255121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37083532 (or 37083526 counting only the distinct ones).

The product of its (nonzero) digits is 100, while the sum is 18.

The square root of 1001255121 is about 31642.6155840506. The cubic root of 1001255121 is about 1000.4181987521.

Adding to 1001255121 its reverse (1215521001), we get a palindrome (2216776122).

The spelling of 1001255121 in words is "one billion, one million, two hundred fifty-five thousand, one hundred twenty-one".