231103551 has 24 divisors (see below), whose sum is σ = 361297920. Its totient is φ = 131008752.

The previous prime is 231103547. The next prime is 231103553. The reversal of 231103551 is 155301132.

It is not a de Polignac number, because 231103551 - 2² = 231103547 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231103553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12480 + ... + 24858.

It is an arithmetic number, because the mean of its divisors is an integer number (15054080).

Almost surely, 2^231103551 is an apocalyptic number.

231103551 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

231103551 is a deficient number, since it is larger than the sum of its proper divisors (130194369).

231103551 is a wasteful number, since it uses less digits than its factorization.

231103551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12523 (or 12516 counting only the distinct ones).

The product of its (nonzero) digits is 450, while the sum is 21.

The square root of 231103551 is about 15202.0903496855. The cubic root of 231103551 is about 613.6709138835.

Adding to 231103551 its reverse (155301132), we get a palindrome (386404683).

The spelling of 231103551 in words is "two hundred thirty-one million, one hundred three thousand, five hundred fifty-one".