2515267721 has 2 divisors, whose sum is σ = 2515267722. Its totient is φ = 2515267720.

The previous prime is 2515267681. The next prime is 2515267723. The reversal of 2515267721 is 1277625152.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1669621321 + 845646400 = 40861^2 + 29080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2515267721 is a prime.

Together with 2515267723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2515267723) 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 as a sum of consecutive naturals, namely, 1257633860 + 1257633861.

It is an arithmetic number, because the mean of its divisors is an integer number (1257633861).

Almost surely, 2^2515267721 is an apocalyptic number.

It is an amenable number.

2515267721 is a deficient number, since it is larger than the sum of its proper divisors (1).

2515267721 is an equidigital number, since it uses as much as digits as its factorization.

2515267721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58800, while the sum is 38.

The square root of 2515267721 is about 50152.4448157814. Note that the first 3 decimals coincide. The cubic root of 2515267721 is about 1359.9660676727.

The spelling of 2515267721 in words is "two billion, five hundred fifteen million, two hundred sixty-seven thousand, seven hundred twenty-one".