11151231 has 16 divisors (see below), whose sum is σ = 18299904. Its totient is φ = 5881824.

The previous prime is 11151209. The next prime is 11151241. The reversal of 11151231 is 13215111.

It is not a de Polignac number, because 11151231 - 2¹¹ = 11149183 is a prime.

It is a super-2 number, since 2×11151231² = 248699905630722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11151231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11151241) 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, 20151 + ... + 20696.

It is an arithmetic number, because the mean of its divisors is an integer number (1143744).

Almost surely, 2^11151231 is an apocalyptic number.

11151231 is a deficient number, since it is larger than the sum of its proper divisors (7148673).

11151231 is a wasteful number, since it uses less digits than its factorization.

11151231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40870.

The product of its digits is 30, while the sum is 15.

The square root of 11151231 is about 3339.3458940337. The cubic root of 11151231 is about 223.4125698398.

Adding to 11151231 its reverse (13215111), we get a palindrome (24366342).

It can be divided in two parts, 1115 and 1231, that added together give a triangular number (2346 = T₆₈).

The spelling of 11151231 in words is "eleven million, one hundred fifty-one thousand, two hundred thirty-one".