5641511221 has 2 divisors, whose sum is σ = 5641511222. Its totient is φ = 5641511220.

The previous prime is 5641511209. The next prime is 5641511243. The reversal of 5641511221 is 1221151465.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5550995025 + 90516196 = 74505^2 + 9514^2 .

It is a cyclic number.

It is not a de Polignac number, because 5641511221 - 2⁵ = 5641511189 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 5641511221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5641511621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2820755610 + 2820755611.

It is an arithmetic number, because the mean of its divisors is an integer number (2820755611).

Almost surely, 2^5641511221 is an apocalyptic number.

It is an amenable number.

5641511221 is a deficient number, since it is larger than the sum of its proper divisors (1).

5641511221 is an equidigital number, since it uses as much as digits as its factorization.

5641511221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 28.

The square root of 5641511221 is about 75109.9941485819. The cubic root of 5641511221 is about 1780.1850606102.

Adding to 5641511221 its reverse (1221151465), we get a palindrome (6862662686).

The spelling of 5641511221 in words is "five billion, six hundred forty-one million, five hundred eleven thousand, two hundred twenty-one".