131231234 has 4 divisors (see below), whose sum is σ = 196846854. Its totient is φ = 65615616.

The previous prime is 131231213. The next prime is 131231237. The reversal of 131231234 is 432132131.

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

It can be written as a sum of positive squares in only one way, i.e., 131171209 + 60025 = 11453^2 + 245^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (131231237) 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 as a sum of consecutive naturals, namely, 32807807 + ... + 32807810.

Almost surely, 2^131231234 is an apocalyptic number.

131231234 is a deficient number, since it is larger than the sum of its proper divisors (65615620).

131231234 is an equidigital number, since it uses as much as digits as its factorization.

131231234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65615619.

The product of its digits is 432, while the sum is 20.

The square root of 131231234 is about 11455.6201927264. The cubic root of 131231234 is about 508.1739566891.

Adding to 131231234 its reverse (432132131), we get a palindrome (563363365).

The spelling of 131231234 in words is "one hundred thirty-one million, two hundred thirty-one thousand, two hundred thirty-four".