131204247 has 4 divisors (see below), whose sum is σ = 174939000. Its totient is φ = 87469496.

The previous prime is 131204221. The next prime is 131204251. The reversal of 131204247 is 742402131.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 742402131 = 3 ⋅247467377.

It is a cyclic number.

It is not a de Polignac number, because 131204247 - 2¹⁴ = 131187863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (131206247) 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, 21867372 + ... + 21867377.

It is an arithmetic number, because the mean of its divisors is an integer number (43734750).

Almost surely, 2^131204247 is an apocalyptic number.

131204247 is a deficient number, since it is larger than the sum of its proper divisors (43734753).

131204247 is an equidigital number, since it uses as much as digits as its factorization.

131204247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43734752.

The product of its (nonzero) digits is 1344, while the sum is 24.

The square root of 131204247 is about 11454.4422387125. The cubic root of 131204247 is about 508.1391198841.

Adding to 131204247 its reverse (742402131), we get a palindrome (873606378).

The spelling of 131204247 in words is "one hundred thirty-one million, two hundred four thousand, two hundred forty-seven".