2243457561 has 4 divisors (see below), whose sum is σ = 2991276752. Its totient is φ = 1495638372.

The previous prime is 2243457539. The next prime is 2243457577. The reversal of 2243457561 is 1657543422.

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 not a de Polignac number, because 2243457561 - 2⁵ = 2243457529 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2243453561) 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, 373909591 + ... + 373909596.

It is an arithmetic number, because the mean of its divisors is an integer number (747819188).

Almost surely, 2^2243457561 is an apocalyptic number.

It is an amenable number.

2243457561 is a deficient number, since it is larger than the sum of its proper divisors (747819191).

2243457561 is an equidigital number, since it uses as much as digits as its factorization.

2243457561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 747819190.

The product of its digits is 201600, while the sum is 39.

The square root of 2243457561 is about 47365.1513351325. The cubic root of 2243457561 is about 1309.0993870001.

The spelling of 2243457561 in words is "two billion, two hundred forty-three million, four hundred fifty-seven thousand, five hundred sixty-one".