1252580821 has 4 divisors (see below), whose sum is σ = 1256190912. Its totient is φ = 1248970732.

The previous prime is 1252580783. The next prime is 1252580839. The reversal of 1252580821 is 1280852521.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-1252580821 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1252580321) 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 in 3 ways as a sum of consecutive naturals, for example, 1804525 + ... + 1805218.

It is an arithmetic number, because the mean of its divisors is an integer number (314047728).

Almost surely, 2^1252580821 is an apocalyptic number.

It is an amenable number.

1252580821 is a deficient number, since it is larger than the sum of its proper divisors (3610091).

1252580821 is an equidigital number, since it uses as much as digits as its factorization.

1252580821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610090.

The product of its (nonzero) digits is 12800, while the sum is 34.

The square root of 1252580821 is about 35391.8185602266. The cubic root of 1252580821 is about 1077.9581967536.

The spelling of 1252580821 in words is "one billion, two hundred fifty-two million, five hundred eighty thousand, eight hundred twenty-one".