131223461 has 2 divisors, whose sum is σ = 131223462. Its totient is φ = 131223460.

The previous prime is 131223457. The next prime is 131223511. The reversal of 131223461 is 164322131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117310561 + 13912900 = 10831^2 + 3730^2 .

It is an emirp because it is prime and its reverse (164322131) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 131223461 - 2² = 131223457 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (131223361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65611730 + 65611731.

It is an arithmetic number, because the mean of its divisors is an integer number (65611731).

Almost surely, 2^131223461 is an apocalyptic number.

It is an amenable number.

131223461 is a deficient number, since it is larger than the sum of its proper divisors (1).

131223461 is an equidigital number, since it uses as much as digits as its factorization.

131223461 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 23.

The square root of 131223461 is about 11455.2809219154. The cubic root of 131223461 is about 508.1639232186.

Adding to 131223461 its reverse (164322131), we get a palindrome (295545592).

The spelling of 131223461 in words is "one hundred thirty-one million, two hundred twenty-three thousand, four hundred sixty-one".