2215212649 has 4 divisors (see below), whose sum is σ = 2385613636. Its totient is φ = 2044811664.

The previous prime is 2215212617. The next prime is 2215212673. The reversal of 2215212649 is 9462125122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1511265625 + 703947024 = 38875^2 + 26532^2 .

It is a cyclic number.

It is not a de Polignac number, because 2215212649 - 2⁵ = 2215212617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2215212049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 85200474 + ... + 85200499.

It is an arithmetic number, because the mean of its divisors is an integer number (596403409).

Almost surely, 2^2215212649 is an apocalyptic number.

It is an amenable number.

2215212649 is a deficient number, since it is larger than the sum of its proper divisors (170400987).

2215212649 is a wasteful number, since it uses less digits than its factorization.

2215212649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170400986.

The product of its digits is 17280, while the sum is 34.

The square root of 2215212649 is about 47066.0456061480. The cubic root of 2215212649 is about 1303.5823576352.

The spelling of 2215212649 in words is "two billion, two hundred fifteen million, two hundred twelve thousand, six hundred forty-nine".