131213644 has 12 divisors (see below), whose sum is σ = 229717600. Its totient is φ = 65580048.

The previous prime is 131213617. The next prime is 131213647. The reversal of 131213644 is 446312131.

It is not an unprimeable number, because it can be changed into a prime (131213647) 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 3 ways as a sum of consecutive naturals, for example, 7837 + ... + 17995.

Almost surely, 2^131213644 is an apocalyptic number.

It is an amenable number.

131213644 is a deficient number, since it is larger than the sum of its proper divisors (98503956).

131213644 is a wasteful number, since it uses less digits than its factorization.

131213644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13392 (or 13390 counting only the distinct ones).

The product of its digits is 1728, while the sum is 25.

The square root of 131213644 is about 11454.8524215723. The cubic root of 131213644 is about 508.1512507651.

Adding to 131213644 its reverse (446312131), we get a palindrome (577525775).

The spelling of 131213644 in words is "one hundred thirty-one million, two hundred thirteen thousand, six hundred forty-four".