123111001312 has 48 divisors (see below), whose sum is σ = 261051608160. Its totient is φ = 56813363712.

The previous prime is 123111001291. The next prime is 123111001331. The reversal of 123111001312 is 213100111321.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4862478 + ... + 4887730.

It is an arithmetic number, because the mean of its divisors is an integer number (5438575170).

Almost surely, 2^123111001312 is an apocalyptic number.

It is an amenable number.

123111001312 is an abundant number, since it is smaller than the sum of its proper divisors (137940606848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123111001312 is a wasteful number, since it uses less digits than its factorization.

123111001312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36995 (or 36987 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 123111001312 its reverse (213100111321), we get a palindrome (336211112633).

The spelling of 123111001312 in words is "one hundred twenty-three billion, one hundred eleven million, one thousand, three hundred twelve".