11131551 has 12 divisors (see below), whose sum is σ = 16300128. Its totient is φ = 7318944.

The previous prime is 11131543. The next prime is 11131553. The reversal of 11131551 is 15513111.

11131551 is a `hidden beast` number, since 1 + 113 + 1 + 551 = 666.

It is not a de Polignac number, because 11131551 - 2³ = 11131543 is a prime.

It is a super-2 number, since 2×11131551² = 247822855331202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11131553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7815 + ... + 9128.

It is an arithmetic number, because the mean of its divisors is an integer number (1358344).

Almost surely, 2^11131551 is an apocalyptic number.

11131551 is a deficient number, since it is larger than the sum of its proper divisors (5168577).

11131551 is a wasteful number, since it uses less digits than its factorization.

11131551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17022 (or 17019 counting only the distinct ones).

The product of its digits is 75, while the sum is 18.

The square root of 11131551 is about 3336.3979079241. The cubic root of 11131551 is about 223.2810642264.

Adding to 11131551 its reverse (15513111), we get a palindrome (26644662).

The spelling of 11131551 in words is "eleven million, one hundred thirty-one thousand, five hundred fifty-one".