1001215263 has 4 divisors (see below), whose sum is σ = 1334953688. Its totient is φ = 667476840.

The previous prime is 1001215261. The next prime is 1001215307. The reversal of 1001215263 is 3625121001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3625121001 = 3 ⋅1208373667.

It is not a de Polignac number, because 1001215263 - 2¹ = 1001215261 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 (1001215261) 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, 166869208 + ... + 166869213.

It is an arithmetic number, because the mean of its divisors is an integer number (333738422).

Almost surely, 2^1001215263 is an apocalyptic number.

1001215263 is a deficient number, since it is larger than the sum of its proper divisors (333738425).

1001215263 is an equidigital number, since it uses as much as digits as its factorization.

1001215263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333738424.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1001215263 is about 31641.9857625908. The cubic root of 1001215263 is about 1000.4049236813.

Adding to 1001215263 its reverse (3625121001), we get a palindrome (4626336264).

The spelling of 1001215263 in words is "one billion, one million, two hundred fifteen thousand, two hundred sixty-three".