2440251521 has 4 divisors (see below), whose sum is σ = 2518969344. Its totient is φ = 2361533700.

The previous prime is 2440251509. The next prime is 2440251547. The reversal of 2440251521 is 1251520442.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1251520442 = 2 ⋅625760221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2440251521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2440250521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39358865 + ... + 39358926.

It is an arithmetic number, because the mean of its divisors is an integer number (629742336).

Almost surely, 2^2440251521 is an apocalyptic number.

It is an amenable number.

2440251521 is a deficient number, since it is larger than the sum of its proper divisors (78717823).

2440251521 is an equidigital number, since it uses as much as digits as its factorization.

2440251521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78717822.

The product of its (nonzero) digits is 3200, while the sum is 26.

The square root of 2440251521 is about 49398.9020222110. The cubic root of 2440251521 is about 1346.3093565305.

Adding to 2440251521 its reverse (1251520442), we get a palindrome (3691771963).

The spelling of 2440251521 in words is "two billion, four hundred forty million, two hundred fifty-one thousand, five hundred twenty-one".