2215550961 has 60 divisors (see below), whose sum is σ = 3708066780. Its totient is φ = 1316165760.

The previous prime is 2215550951. The next prime is 2215550977. The reversal of 2215550961 is 1690555122.

2215550961 is a `hidden beast` number, since 2 + 2 + 15 + 550 + 96 + 1 = 666.

2215550961 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 460359936 + 1755191025 = 21456^2 + 41895^2 .

It is not a de Polignac number, because 2215550961 - 2⁵ = 2215550929 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2215550951) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 394191 + ... + 399771.

It is an arithmetic number, because the mean of its divisors is an integer number (61801113).

Almost surely, 2^2215550961 is an apocalyptic number.

It is an amenable number.

2215550961 is a deficient number, since it is larger than the sum of its proper divisors (1492515819).

2215550961 is a wasteful number, since it uses less digits than its factorization.

2215550961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5648 (or 5626 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 2215550961 is about 47069.6394823670. The cubic root of 2215550961 is about 1303.6487162164.

The spelling of 2215550961 in words is "two billion, two hundred fifteen million, five hundred fifty thousand, nine hundred sixty-one".