2478552521 has 4 divisors (see below), whose sum is σ = 2478653844. Its totient is φ = 2478451200.

The previous prime is 2478552497. The next prime is 2478552533. The reversal of 2478552521 is 1252558742.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2024010121 + 454542400 = 44989^2 + 21320^2 .

It is a cyclic number.

It is not a de Polignac number, because 2478552521 - 2⁶ = 2478552457 is a prime.

It is a super-2 number, since 2×2478552521² = 12286445198710910882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2478552581) 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, 11261 + ... + 71301.

It is an arithmetic number, because the mean of its divisors is an integer number (619663461).

Almost surely, 2^2478552521 is an apocalyptic number.

It is an amenable number.

2478552521 is a deficient number, since it is larger than the sum of its proper divisors (101323).

2478552521 is an equidigital number, since it uses as much as digits as its factorization.

2478552521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101322.

The product of its digits is 224000, while the sum is 41.

The square root of 2478552521 is about 49785.0632318570. The cubic root of 2478552521 is about 1353.3164952904.

The spelling of 2478552521 in words is "two billion, four hundred seventy-eight million, five hundred fifty-two thousand, five hundred twenty-one".