1001540253 has 12 divisors (see below), whose sum is σ = 1553409600. Its totient is φ = 572308632.

The previous prime is 1001540231. The next prime is 1001540257. The reversal of 1001540253 is 3520451001.

It is not a de Polignac number, because 1001540253 - 2⁹ = 1001539741 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001540257) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3406453 + ... + 3406746.

It is an arithmetic number, because the mean of its divisors is an integer number (129450800).

Almost surely, 2^1001540253 is an apocalyptic number.

It is an amenable number.

1001540253 is a deficient number, since it is larger than the sum of its proper divisors (551869347).

1001540253 is an equidigital number, since it uses as much as digits as its factorization.

1001540253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6813216 (or 6813209 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1001540253 is about 31647.1207695108. The cubic root of 1001540253 is about 1000.5131542943.

Adding to 1001540253 its reverse (3520451001), we get a palindrome (4521991254).

The spelling of 1001540253 in words is "one billion, one million, five hundred forty thousand, two hundred fifty-three".