223145523 has 10 divisors (see below), whose sum is σ = 333340964. Its totient is φ = 148763628.

The previous prime is 223145479. The next prime is 223145543. The reversal of 223145523 is 325541322.

It is a happy number.

It is not a de Polignac number, because 223145523 - 2²² = 218951219 is a prime.

It is a super-3 number, since 3×223145523³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (223145543) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1377361 + ... + 1377522.

Almost surely, 2^223145523 is an apocalyptic number.

223145523 is a deficient number, since it is larger than the sum of its proper divisors (110195441).

223145523 is an equidigital number, since it uses as much as digits as its factorization.

223145523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2754895 (or 2754886 counting only the distinct ones).

The product of its digits is 7200, while the sum is 27.

The square root of 223145523 is about 14938.0561988500. The cubic root of 223145523 is about 606.5445795799.

Adding to 223145523 its reverse (325541322), we get a palindrome (548686845).

The spelling of 223145523 in words is "two hundred twenty-three million, one hundred forty-five thousand, five hundred twenty-three".