123111401255 has 4 divisors (see below), whose sum is σ = 147733681512. Its totient is φ = 98489121000.

The previous prime is 123111401233. The next prime is 123111401263. The reversal of 123111401255 is 552104111321.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 123111401255 - 2¹² = 123111397159 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12311140121 + ... + 12311140130.

It is an arithmetic number, because the mean of its divisors is an integer number (36933420378).

Almost surely, 2^123111401255 is an apocalyptic number.

123111401255 is a deficient number, since it is larger than the sum of its proper divisors (24622280257).

123111401255 is an equidigital number, since it uses as much as digits as its factorization.

123111401255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24622280256.

The product of its (nonzero) digits is 1200, while the sum is 26.

Adding to 123111401255 its reverse (552104111321), we get a palindrome (675215512576).

The spelling of 123111401255 in words is "one hundred twenty-three billion, one hundred eleven million, four hundred one thousand, two hundred fifty-five".