1111012123 has 4 divisors (see below), whose sum is σ = 1196474608. Its totient is φ = 1025549640.

The previous prime is 1111012117. The next prime is 1111012141. The reversal of 1111012123 is 3212101111.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1111012123 - 2¹³ = 1111003931 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 85462471 = 1111012123 / (1 + 1 + 1 + 1 + 0 + 1 + 2 + 1 + 2 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1111012153) 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, 42731223 + ... + 42731248.

It is an arithmetic number, because the mean of its divisors is an integer number (299118652).

Almost surely, 2^1111012123 is an apocalyptic number.

1111012123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1111012123 is a deficient number, since it is larger than the sum of its proper divisors (85462485).

1111012123 is an equidigital number, since it uses as much as digits as its factorization.

1111012123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85462484.

The product of its (nonzero) digits is 12, while the sum is 13.

The square root of 1111012123 is about 33331.8484785948. The cubic root of 1111012123 is about 1035.7134098302.

Adding to 1111012123 its reverse (3212101111), we get a palindrome (4323113234).

The spelling of 1111012123 in words is "one billion, one hundred eleven million, twelve thousand, one hundred twenty-three".