1225123543 has 8 divisors (see below), whose sum is σ = 1461017088. Its totient is φ = 1004448984.

The previous prime is 1225123519. The next prime is 1225123579. The reversal of 1225123543 is 3453215221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1225123543 - 2⁵ = 1225123511 is a prime.

It is a super-2 number, since 2×1225123543² = 3001855391225745698, 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 (1225123043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3804571 + ... + 3804892.

It is an arithmetic number, because the mean of its divisors is an integer number (182627136).

Almost surely, 2^1225123543 is an apocalyptic number.

1225123543 is a deficient number, since it is larger than the sum of its proper divisors (235893545).

1225123543 is an equidigital number, since it uses as much as digits as its factorization.

1225123543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7609493.

The product of its digits is 7200, while the sum is 28.

The square root of 1225123543 is about 35001.7648555041. The cubic root of 1225123543 is about 1070.0234492779.

Adding to 1225123543 its reverse (3453215221), we get a palindrome (4678338764).

The spelling of 1225123543 in words is "one billion, two hundred twenty-five million, one hundred twenty-three thousand, five hundred forty-three".