223540551 has 24 divisors (see below), whose sum is σ = 350060256. Its totient is φ = 136641600.

The previous prime is 223540549. The next prime is 223540553. The reversal of 223540551 is 155045322.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (223540549) and next prime (223540553).

It is not a de Polignac number, because 223540551 - 2¹ = 223540549 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (223540553) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11341 + ... + 23993.

It is an arithmetic number, because the mean of its divisors is an integer number (14585844).

Almost surely, 2^223540551 is an apocalyptic number.

223540551 is a deficient number, since it is larger than the sum of its proper divisors (126519705).

223540551 is a wasteful number, since it uses less digits than its factorization.

223540551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12823 (or 12820 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 223540551 is about 14951.2725545353. The cubic root of 223540551 is about 606.9022846341.

Adding to 223540551 its reverse (155045322), we get a palindrome (378585873).

The spelling of 223540551 in words is "two hundred twenty-three million, five hundred forty thousand, five hundred fifty-one".