1231423005 has 16 divisors (see below), whose sum is σ = 1970740800. Its totient is φ = 656604288.

The previous prime is 1231423001. The next prime is 1231423019. The reversal of 1231423005 is 5003241321.

It is not a de Polignac number, because 1231423005 - 2² = 1231423001 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231423001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 87969 + ... + 101001.

It is an arithmetic number, because the mean of its divisors is an integer number (123171300).

Almost surely, 2^1231423005 is an apocalyptic number.

1231423005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1231423005 is a deficient number, since it is larger than the sum of its proper divisors (739317795).

1231423005 is a wasteful number, since it uses less digits than its factorization.

1231423005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19340.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 1231423005 is about 35091.6372516302. The cubic root of 1231423005 is about 1071.8542991466.

Adding to 1231423005 its reverse (5003241321), we get a palindrome (6234664326).

The spelling of 1231423005 in words is "one billion, two hundred thirty-one million, four hundred twenty-three thousand, five".