1001251541 has 4 divisors (see below), whose sum is σ = 1007971500. Its totient is φ = 994531584.

The previous prime is 1001251523. The next prime is 1001251577. The reversal of 1001251541 is 1451521001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1451521001 = 7 ⋅207360143.

It can be written as a sum of positive squares in 2 ways, for example, as 139594225 + 861657316 = 11815^2 + 29354^2 .

It is a cyclic number.

It is not a de Polignac number, because 1001251541 - 2¹⁸ = 1000989397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001251501) 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, 3359756 + ... + 3360053.

It is an arithmetic number, because the mean of its divisors is an integer number (251992875).

Almost surely, 2^1001251541 is an apocalyptic number.

It is an amenable number.

1001251541 is a deficient number, since it is larger than the sum of its proper divisors (6719959).

1001251541 is an equidigital number, since it uses as much as digits as its factorization.

1001251541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6719958.

The product of its (nonzero) digits is 200, while the sum is 20.

The square root of 1001251541 is about 31642.5590147194. The cubic root of 1001251541 is about 1000.4170064148.

Adding to 1001251541 its reverse (1451521001), we get a palindrome (2452772542).

The spelling of 1001251541 in words is "one billion, one million, two hundred fifty-one thousand, five hundred forty-one".