2516551409 has 4 divisors (see below), whose sum is σ = 2570095104. Its totient is φ = 2463007716.

The previous prime is 2516551403. The next prime is 2516551421. The reversal of 2516551409 is 9041556152.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516551409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2516551403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26771777 + ... + 26771870.

It is an arithmetic number, because the mean of its divisors is an integer number (642523776).

Almost surely, 2^2516551409 is an apocalyptic number.

It is an amenable number.

2516551409 is a deficient number, since it is larger than the sum of its proper divisors (53543695).

2516551409 is an equidigital number, since it uses as much as digits as its factorization.

2516551409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53543694.

The product of its (nonzero) digits is 54000, while the sum is 38.

The square root of 2516551409 is about 50165.2410439739. The cubic root of 2516551409 is about 1360.1973850260.

The spelling of 2516551409 in words is "two billion, five hundred sixteen million, five hundred fifty-one thousand, four hundred nine".