2516171851 has 4 divisors (see below), whose sum is σ = 2517165400. Its totient is φ = 2515178304.

The previous prime is 2516171821. The next prime is 2516171897. The reversal of 2516171851 is 1581716152.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2516171851 is a prime.

It is a super-2 number, since 2×2516171851² = 12662241567529532402, which contains 22 as substring.

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 2516171851.

It is not an unprimeable number, because it can be changed into a prime (2516171821) 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, 492966 + ... + 498043.

It is an arithmetic number, because the mean of its divisors is an integer number (629291350).

Almost surely, 2^2516171851 is an apocalyptic number.

2516171851 is a deficient number, since it is larger than the sum of its proper divisors (993549).

2516171851 is an equidigital number, since it uses as much as digits as its factorization.

2516171851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993548.

The product of its digits is 16800, while the sum is 37.

The square root of 2516171851 is about 50161.4578237116. The cubic root of 2516171851 is about 1360.1289978202.

The spelling of 2516171851 in words is "two billion, five hundred sixteen million, one hundred seventy-one thousand, eight hundred fifty-one".