1311010123 has 4 divisors (see below), whose sum is σ = 1311230088. Its totient is φ = 1310790160.

The previous prime is 1311010073. The next prime is 1311010147. The reversal of 1311010123 is 3210101131.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1311010123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311010153) 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, 100786 + ... + 113047.

It is an arithmetic number, because the mean of its divisors is an integer number (327807522).

Almost surely, 2^1311010123 is an apocalyptic number.

1311010123 is a deficient number, since it is larger than the sum of its proper divisors (219965).

1311010123 is an equidigital number, since it uses as much as digits as its factorization.

1311010123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 219964.

The product of its (nonzero) digits is 18, while the sum is 13.

The square root of 1311010123 is about 36207.8737707698. The cubic root of 1311010123 is about 1094.4653459044.

Adding to 1311010123 its reverse (3210101131), we get a palindrome (4521111254).

The spelling of 1311010123 in words is "one billion, three hundred eleven million, ten thousand, one hundred twenty-three".