131121247 has 2 divisors, whose sum is σ = 131121248. Its totient is φ = 131121246.

The previous prime is 131121241. The next prime is 131121253. The reversal of 131121247 is 742121131.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (131121241) and next prime (131121253).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-131121247 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131121241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65560623 + 65560624.

It is an arithmetic number, because the mean of its divisors is an integer number (65560624).

Almost surely, 2^131121247 is an apocalyptic number.

131121247 is a deficient number, since it is larger than the sum of its proper divisors (1).

131121247 is an equidigital number, since it uses as much as digits as its factorization.

131121247 is an evil number, because the sum of its binary digits is even.

The product of its digits is 336, while the sum is 22.

The square root of 131121247 is about 11450.8186170247. The cubic root of 131121247 is about 508.0319474297.

Adding to 131121247 its reverse (742121131), we get a palindrome (873242378).

The spelling of 131121247 in words is "one hundred thirty-one million, one hundred twenty-one thousand, two hundred forty-seven".