11213555 has 16 divisors (see below), whose sum is σ = 13789440. Its totient is φ = 8752128.

The previous prime is 11213551. The next prime is 11213567. The reversal of 11213555 is 55531211.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 11213555 - 2² = 11213551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11213555.

It is not an unprimeable number, because it can be changed into a prime (11213551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50174 + ... + 50396.

It is an arithmetic number, because the mean of its divisors is an integer number (861840).

Almost surely, 2^11213555 is an apocalyptic number.

11213555 is a deficient number, since it is larger than the sum of its proper divisors (2575885).

11213555 is a wasteful number, since it uses less digits than its factorization.

11213555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430.

The product of its digits is 750, while the sum is 23.

The square root of 11213555 is about 3348.6646592336. The cubic root of 11213555 is about 223.8280129120.

Adding to 11213555 its reverse (55531211), we get a palindrome (66744766).

The spelling of 11213555 in words is "eleven million, two hundred thirteen thousand, five hundred fifty-five".