131227861 has 2 divisors, whose sum is σ = 131227862. Its totient is φ = 131227860.

The previous prime is 131227853. The next prime is 131227891. The reversal of 131227861 is 168722131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 123076836 + 8151025 = 11094^2 + 2855^2 .

It is a cyclic number.

It is not a de Polignac number, because 131227861 - 2³ = 131227853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131227891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65613930 + 65613931.

It is an arithmetic number, because the mean of its divisors is an integer number (65613931).

Almost surely, 2^131227861 is an apocalyptic number.

It is an amenable number.

131227861 is a deficient number, since it is larger than the sum of its proper divisors (1).

131227861 is an equidigital number, since it uses as much as digits as its factorization.

131227861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4032, while the sum is 31.

The square root of 131227861 is about 11455.4729714665. The cubic root of 131227861 is about 508.1696028338.

Adding to 131227861 its reverse (168722131), we get a palindrome (299949992).

The spelling of 131227861 in words is "one hundred thirty-one million, two hundred twenty-seven thousand, eight hundred sixty-one".