11231120551 has 16 divisors (see below), whose sum is σ = 13287493440. Its totient is φ = 9288195840.

The previous prime is 11231120543. The next prime is 11231120599. The reversal of 11231120551 is 15502113211.

It is not a de Polignac number, because 11231120551 - 2³ = 11231120543 is a prime.

It is a super-2 number, since 2×11231120551² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11231120651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 281965 + ... + 319321.

It is an arithmetic number, because the mean of its divisors is an integer number (830468340).

Almost surely, 2^11231120551 is an apocalyptic number.

11231120551 is a deficient number, since it is larger than the sum of its proper divisors (2056372889).

11231120551 is a wasteful number, since it uses less digits than its factorization.

11231120551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38874.

The product of its (nonzero) digits is 300, while the sum is 22.

Adding to 11231120551 its reverse (15502113211), we get a palindrome (26733233762).

The spelling of 11231120551 in words is "eleven billion, two hundred thirty-one million, one hundred twenty thousand, five hundred fifty-one".