2521606145 has 4 divisors (see below), whose sum is σ = 3025927380. Its totient is φ = 2017284912.

The previous prime is 2521606111. The next prime is 2521606177. The reversal of 2521606145 is 5416061252.

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

It can be written as a sum of positive squares in 2 ways, for example, as 936849664 + 1584756481 = 30608^2 + 39809^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2521606145 is a prime.

It is a super-2 number, since 2×2521606145² = 12716995101003522050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 252160610 + ... + 252160619.

It is an arithmetic number, because the mean of its divisors is an integer number (756481845).

Almost surely, 2^2521606145 is an apocalyptic number.

It is an amenable number.

2521606145 is a deficient number, since it is larger than the sum of its proper divisors (504321235).

2521606145 is an equidigital number, since it uses as much as digits as its factorization.

2521606145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 504321234.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 2521606145 is about 50215.5966309273. The cubic root of 2521606145 is about 1361.1074718042.

Adding to 2521606145 its reverse (5416061252), we get a palindrome (7937667397).

The spelling of 2521606145 in words is "two billion, five hundred twenty-one million, six hundred six thousand, one hundred forty-five".