2521371761 has 4 divisors (see below), whose sum is σ = 2526771312. Its totient is φ = 2515972212.

The previous prime is 2521371739. The next prime is 2521371773. The reversal of 2521371761 is 1671731252.

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 not a de Polignac number, because 2521371761 - 2¹⁴ = 2521355377 is a prime.

It is a super-2 number, since 2×2521371761² = 12714631114336482242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2521371361) 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 3 ways as a sum of consecutive naturals, for example, 2699075 + ... + 2700008.

It is an arithmetic number, because the mean of its divisors is an integer number (631692828).

Almost surely, 2^2521371761 is an apocalyptic number.

It is an amenable number.

2521371761 is a deficient number, since it is larger than the sum of its proper divisors (5399551).

2521371761 is an equidigital number, since it uses as much as digits as its factorization.

2521371761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399550.

The product of its digits is 17640, while the sum is 35.

The square root of 2521371761 is about 50213.2627997823. The cubic root of 2521371761 is about 1361.0652987234.

The spelling of 2521371761 in words is "two billion, five hundred twenty-one million, three hundred seventy-one thousand, seven hundred sixty-one".