1231623143 has 4 divisors (see below), whose sum is σ = 1237001640. Its totient is φ = 1226244648.

The previous prime is 1231623121. The next prime is 1231623167. The reversal of 1231623143 is 3413261321.

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 1231623143 - 2⁶ = 1231623079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1233623143) 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, 2688905 + ... + 2689362.

It is an arithmetic number, because the mean of its divisors is an integer number (309250410).

Almost surely, 2^1231623143 is an apocalyptic number.

1231623143 is a deficient number, since it is larger than the sum of its proper divisors (5378497).

1231623143 is an equidigital number, since it uses as much as digits as its factorization.

1231623143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378496.

The product of its digits is 2592, while the sum is 26.

The square root of 1231623143 is about 35094.4887838532. The cubic root of 1231623143 is about 1071.9123639909.

Adding to 1231623143 its reverse (3413261321), we get a palindrome (4644884464).

The spelling of 1231623143 in words is "one billion, two hundred thirty-one million, six hundred twenty-three thousand, one hundred forty-three".