2213407561 has 4 divisors (see below), whose sum is σ = 2213511300. Its totient is φ = 2213303824.

The previous prime is 2213407529. The next prime is 2213407577. The reversal of 2213407561 is 1657043122.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 1134679225 + 1078728336 = 33685^2 + 32844^2 .

It is a cyclic number.

It is not a de Polignac number, because 2213407561 - 2⁵ = 2213407529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2213407061) 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, 6826 + ... + 66883.

It is an arithmetic number, because the mean of its divisors is an integer number (553377825).

Almost surely, 2^2213407561 is an apocalyptic number.

It is an amenable number.

2213407561 is a deficient number, since it is larger than the sum of its proper divisors (103739).

2213407561 is an equidigital number, since it uses as much as digits as its factorization.

2213407561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103738.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 2213407561 is about 47046.8655810353. The cubic root of 2213407561 is about 1303.2281824118.

The spelling of 2213407561 in words is "two billion, two hundred thirteen million, four hundred seven thousand, five hundred sixty-one".