11231551 has 4 divisors (see below), whose sum is σ = 11252632. Its totient is φ = 11210472.

The previous prime is 11231537. The next prime is 11231629. The reversal of 11231551 is 15513211.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11231551 - 2⁹ = 11231039 is a prime.

It is a super-2 number, since 2×11231551² = 252295475731202, which 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 (11231501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9720 + ... + 10813.

It is an arithmetic number, because the mean of its divisors is an integer number (2813158).

Almost surely, 2^11231551 is an apocalyptic number.

11231551 is a deficient number, since it is larger than the sum of its proper divisors (21081).

11231551 is an equidigital number, since it uses as much as digits as its factorization.

11231551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21080.

The product of its digits is 150, while the sum is 19.

The square root of 11231551 is about 3351.3506232562. The cubic root of 11231551 is about 223.9476852213.

Adding to 11231551 its reverse (15513211), we get a palindrome (26744762).

The spelling of 11231551 in words is "eleven million, two hundred thirty-one thousand, five hundred fifty-one".