11551331 has 8 divisors (see below), whose sum is σ = 12870144. Its totient is φ = 10277320.

The previous prime is 11551327. The next prime is 11551333. The reversal of 11551331 is 13315511.

11551331 = 303² + 304² + ... + 396².

11551331 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 11551331 - 2² = 11551327 is a prime.

It is a super-2 number, since 2×11551331² = 266866495743122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11551333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10655 + ... + 11688.

It is an arithmetic number, because the mean of its divisors is an integer number (1608768).

Almost surely, 2^11551331 is an apocalyptic number.

11551331 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

11551331 is a deficient number, since it is larger than the sum of its proper divisors (1318813).

11551331 is a wasteful number, since it uses less digits than its factorization.

11551331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22401.

The product of its digits is 225, while the sum is 20.

The square root of 11551331 is about 3398.7249079618. The cubic root of 11551331 is about 226.0532088150.

Adding to 11551331 its reverse (13315511), we get a palindrome (24866842).

The spelling of 11551331 in words is "eleven million, five hundred fifty-one thousand, three hundred thirty-one".