2515151721 has 8 divisors (see below), whose sum is σ = 3354223360. Its totient is φ = 1676423952.

The previous prime is 2515151719. The next prime is 2515151741. The reversal of 2515151721 is 1271515152.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2515151721 - 2¹ = 2515151719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2515151711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68386 + ... + 98523.

It is an arithmetic number, because the mean of its divisors is an integer number (419277920).

Almost surely, 2^2515151721 is an apocalyptic number.

It is an amenable number.

2515151721 is a deficient number, since it is larger than the sum of its proper divisors (839071639).

2515151721 is a wasteful number, since it uses less digits than its factorization.

2515151721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171935.

The product of its digits is 3500, while the sum is 30.

The square root of 2515151721 is about 50151.2883284168. The cubic root of 2515151721 is about 1359.9451608871.

Adding to 2515151721 its reverse (1271515152), we get a palindrome (3786666873).

The spelling of 2515151721 in words is "two billion, five hundred fifteen million, one hundred fifty-one thousand, seven hundred twenty-one".