123343155541 has 4 divisors (see below), whose sum is σ = 124056121932. Its totient is φ = 122630189152.

The previous prime is 123343155521. The next prime is 123343155619. The reversal of 123343155541 is 145551343321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 145551343321 = 24071 ⋅6046751.

It can be written as a sum of positive squares in 2 ways, for example, as 81827463025 + 41515692516 = 286055^2 + 203754^2 .

It is not a de Polignac number, because 123343155541 - 2⁹ = 123343155029 is a prime.

It is a super-2 number, since 2×123343155541² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123343155541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123343155521) 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, 356482936 + ... + 356483281.

It is an arithmetic number, because the mean of its divisors is an integer number (31014030483).

Almost surely, 2^123343155541 is an apocalyptic number.

It is an amenable number.

123343155541 is a deficient number, since it is larger than the sum of its proper divisors (712966391).

123343155541 is an equidigital number, since it uses as much as digits as its factorization.

123343155541 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712966390.

The product of its digits is 108000, while the sum is 37.

Adding to 123343155541 its reverse (145551343321), we get a palindrome (268894498862).

The spelling of 123343155541 in words is "one hundred twenty-three billion, three hundred forty-three million, one hundred fifty-five thousand, five hundred forty-one".