1311923 has 2 divisors, whose sum is σ = 1311924. Its totient is φ = 1311922.

The previous prime is 1311917. The next prime is 1311967. The reversal of 1311923 is 3291131.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1311923 - 2¹⁰ = 1310899 is a prime.

It is a super-2 number, since 2×1311923² = 3442283915858, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 1311895 and 1311904.

It is not a weakly prime, because it can be changed into another prime (1311223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655961 + 655962.

It is an arithmetic number, because the mean of its divisors is an integer number (655962).

2^1311923 is an apocalyptic number.

1311923 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311923 is an equidigital number, since it uses as much as digits as its factorization.

1311923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 162, while the sum is 20.

The square root of 1311923 is about 1145.3920726109. The cubic root of 1311923 is about 109.4719318119.

The spelling of 1311923 in words is "one million, three hundred eleven thousand, nine hundred twenty-three".