11551631 has 16 divisors (see below), whose sum is σ = 14457408. Its totient is φ = 8985600.

The previous prime is 11551609. The next prime is 11551643. The reversal of 11551631 is 13615511.

It is not a de Polignac number, because 11551631 - 2⁶ = 11551567 is a prime.

It is a super-2 number, since 2×11551631² = 266880357520322, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 11551597 and 11551606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11551531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4511 + ... + 6591.

It is an arithmetic number, because the mean of its divisors is an integer number (903588).

Almost surely, 2^11551631 is an apocalyptic number.

11551631 is a deficient number, since it is larger than the sum of its proper divisors (2905777).

11551631 is a wasteful number, since it uses less digits than its factorization.

11551631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162.

The product of its digits is 450, while the sum is 23.

The square root of 11551631 is about 3398.7690418738. The cubic root of 11551631 is about 226.0551657432.

The spelling of 11551631 in words is "eleven million, five hundred fifty-one thousand, six hundred thirty-one".