1261123 has 4 divisors (see below), whose sum is σ = 1304640. Its totient is φ = 1217608.

The previous prime is 1261121. The next prime is 1261133. The reversal of 1261123 is 3211621.

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 1261123 - 2¹ = 1261121 is a prime.

It is a super-2 number, since 2×1261123² = 3180862442258, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1261097 and 1261106.

It is not an unprimeable number, because it can be changed into a prime (1261121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21715 + ... + 21772.

It is an arithmetic number, because the mean of its divisors is an integer number (326160).

2^1261123 is an apocalyptic number.

1261123 is a deficient number, since it is larger than the sum of its proper divisors (43517).

1261123 is an equidigital number, since it uses as much as digits as its factorization.

1261123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43516.

The product of its digits is 72, while the sum is 16.

The square root of 1261123 is about 1122.9973285810. The cubic root of 1261123 is about 108.0403084565.

Adding to 1261123 its reverse (3211621), we get a palindrome (4472744).

The spelling of 1261123 in words is "one million, two hundred sixty-one thousand, one hundred twenty-three".