2215500551 has 4 divisors (see below), whose sum is σ = 2416909704. Its totient is φ = 2014091400.

The previous prime is 2215500473. The next prime is 2215500577. The reversal of 2215500551 is 1550055122.

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

It is a cyclic number.

It is not a de Polignac number, because 2215500551 - 2²² = 2211306247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2215500551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2215500451) 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, 100704560 + ... + 100704581.

It is an arithmetic number, because the mean of its divisors is an integer number (604227426).

Almost surely, 2^2215500551 is an apocalyptic number.

2215500551 is a deficient number, since it is larger than the sum of its proper divisors (201409153).

2215500551 is a wasteful number, since it uses less digits than its factorization.

2215500551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201409152.

The product of its (nonzero) digits is 2500, while the sum is 26.

The square root of 2215500551 is about 47069.1039961459. The cubic root of 2215500551 is about 1303.6388289195.

Adding to 2215500551 its reverse (1550055122), we get a palindrome (3765555673).

The spelling of 2215500551 in words is "two billion, two hundred fifteen million, five hundred thousand, five hundred fifty-one".