1001140251 has 32 divisors (see below), whose sum is σ = 1478020608. Its totient is φ = 599554560.

The previous prime is 1001140243. The next prime is 1001140253. The reversal of 1001140251 is 1520411001.

It is a happy number.

1001140251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1001140251 - 2³ = 1001140243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1001140251.

It is not an unprimeable number, because it can be changed into a prime (1001140253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1063441 + ... + 1064381.

It is an arithmetic number, because the mean of its divisors is an integer number (46188144).

Almost surely, 2^1001140251 is an apocalyptic number.

1001140251 is a deficient number, since it is larger than the sum of its proper divisors (476880357).

1001140251 is a wasteful number, since it uses less digits than its factorization.

1001140251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1891.

The product of its (nonzero) digits is 40, while the sum is 15.

The square root of 1001140251 is about 31640.8004165508. The cubic root of 1001140251 is about 1000.3799392945.

Adding to 1001140251 its reverse (1520411001), we get a palindrome (2521551252).

The spelling of 1001140251 in words is "one billion, one million, one hundred forty thousand, two hundred fifty-one".