2621132809 has 3 divisors (see below), whose sum is σ = 2621184007. Its totient is φ = 2621081612.

The previous prime is 2621132797. The next prime is 2621132819. The reversal of 2621132809 is 9082311262.

The square root of 2621132809 is 51197.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 2596412025 + 24720784 = 50955^2 + 4972^2 .

It is not a de Polignac number, because 2621132809 - 2²⁵ = 2587578377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2621132819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 25599 + ... + 76795.

Almost surely, 2^2621132809 is an apocalyptic number.

2621132809 is the 51197-th square number.

2621132809 is the 25599-th centered octagonal number.

It is an amenable number.

2621132809 is a deficient number, since it is larger than the sum of its proper divisors (51198).

2621132809 is an frugal number, since it uses more digits than its factorization.

2621132809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102394 (or 51197 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The cubic root of 2621132809 is about 1378.7843402272.

The spelling of 2621132809 in words is "two billion, six hundred twenty-one million, one hundred thirty-two thousand, eight hundred nine".