2257447521 has 8 divisors (see below), whose sum is σ = 3439920064. Its totient is φ = 1289970000.

The previous prime is 2257447499. The next prime is 2257447541. The reversal of 2257447521 is 1257447522.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2257447521 - 2⁹ = 2257447009 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2257447521.

It is not an unprimeable number, because it can be changed into a prime (2257447541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53748730 + ... + 53748771.

It is an arithmetic number, because the mean of its divisors is an integer number (429990008).

Almost surely, 2^2257447521 is an apocalyptic number.

2257447521 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2257447521 is a deficient number, since it is larger than the sum of its proper divisors (1182472543).

2257447521 is a wasteful number, since it uses less digits than its factorization.

2257447521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107497511.

The product of its digits is 156800, while the sum is 39.

The square root of 2257447521 is about 47512.6038120413. The cubic root of 2257447521 is about 1311.8148845957.

Subtracting from 2257447521 its reverse (1257447522), we obtain a palindrome (999999999).

The spelling of 2257447521 in words is "two billion, two hundred fifty-seven million, four hundred forty-seven thousand, five hundred twenty-one".