131211243 has 12 divisors (see below), whose sum is σ = 190511880. Its totient is φ = 87019776.

The previous prime is 131211229. The next prime is 131211271. The reversal of 131211243 is 342112131.

It is not a de Polignac number, because 131211243 - 2¹⁸ = 130949099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (131211043) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36033 + ... + 39506.

It is an arithmetic number, because the mean of its divisors is an integer number (15875990).

Almost surely, 2^131211243 is an apocalyptic number.

131211243 is a deficient number, since it is larger than the sum of its proper divisors (59300637).

131211243 is a wasteful number, since it uses less digits than its factorization.

131211243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75738 (or 75735 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 131211243 is about 11454.7476183459. The cubic root of 131211243 is about 508.1481512942.

Adding to 131211243 its reverse (342112131), we get a palindrome (473323374).

The spelling of 131211243 in words is "one hundred thirty-one million, two hundred eleven thousand, two hundred forty-three".