11161555 has 16 divisors (see below), whose sum is σ = 14183424. Its totient is φ = 8414560.

The previous prime is 11161547. The next prime is 11161559. The reversal of 11161555 is 55516111.

It is not a de Polignac number, because 11161555 - 2³ = 11161547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11161559) 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, 7482 + ... + 8848.

It is an arithmetic number, because the mean of its divisors is an integer number (886464).

Almost surely, 2^11161555 is an apocalyptic number.

11161555 is a deficient number, since it is larger than the sum of its proper divisors (3021869).

11161555 is a wasteful number, since it uses less digits than its factorization.

11161555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1466.

The product of its digits is 750, while the sum is 25.

The square root of 11161555 is about 3340.8913481285. The cubic root of 11161555 is about 223.4814949637.

Adding to 11161555 its reverse (55516111), we get a palindrome (66677666).

The spelling of 11161555 in words is "eleven million, one hundred sixty-one thousand, five hundred fifty-five".