1001025253 has 4 divisors (see below), whose sum is σ = 1003910400. Its totient is φ = 998140108.

The previous prime is 1001025197. The next prime is 1001025287. The reversal of 1001025253 is 3525201001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 3525201001 = 7 ⋅503600143.

It is a cyclic number.

It is not a de Polignac number, because 1001025253 - 2²¹ = 998928101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1001025253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001025293) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1442053 + ... + 1442746.

It is an arithmetic number, because the mean of its divisors is an integer number (250977600).

Almost surely, 2^1001025253 is an apocalyptic number.

It is an amenable number.

1001025253 is a deficient number, since it is larger than the sum of its proper divisors (2885147).

1001025253 is an equidigital number, since it uses as much as digits as its factorization.

1001025253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2885146.

The product of its (nonzero) digits is 300, while the sum is 19.

The square root of 1001025253 is about 31638.9831220916. The cubic root of 1001025253 is about 1000.3416342727.

Adding to 1001025253 its reverse (3525201001), we get a palindrome (4526226254).

The spelling of 1001025253 in words is "one billion, one million, twenty-five thousand, two hundred fifty-three".