2215632781 has 8 divisors (see below), whose sum is σ = 2263497984. Its totient is φ = 2167797840.

The previous prime is 2215632773. The next prime is 2215632817. The reversal of 2215632781 is 1872365122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2215632781 - 2³ = 2215632773 is a prime.

It is a super-2 number, since 2×2215632781² = 9818057240483587922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2215632781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215632701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202456 + ... + 213118.

It is an arithmetic number, because the mean of its divisors is an integer number (282937248).

Almost surely, 2^2215632781 is an apocalyptic number.

It is an amenable number.

2215632781 is a deficient number, since it is larger than the sum of its proper divisors (47865203).

2215632781 is a wasteful number, since it uses less digits than its factorization.

2215632781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15131.

The product of its digits is 40320, while the sum is 37.

The square root of 2215632781 is about 47070.5086120811. The cubic root of 2215632781 is about 1303.6647638763.

The spelling of 2215632781 in words is "two billion, two hundred fifteen million, six hundred thirty-two thousand, seven hundred eighty-one".