124421431261 has 2 divisors, whose sum is σ = 124421431262. Its totient is φ = 124421431260.

The previous prime is 124421431231. The next prime is 124421431297. The reversal of 124421431261 is 162134124421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93443319225 + 30978112036 = 305685^2 + 176006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-124421431261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (124421431231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62210715630 + 62210715631.

It is an arithmetic number, because the mean of its divisors is an integer number (62210715631).

Almost surely, 2^124421431261 is an apocalyptic number.

It is an amenable number.

124421431261 is a deficient number, since it is larger than the sum of its proper divisors (1).

124421431261 is an equidigital number, since it uses as much as digits as its factorization.

124421431261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

Adding to 124421431261 its reverse (162134124421), we get a palindrome (286555555682).

The spelling of 124421431261 in words is "one hundred twenty-four billion, four hundred twenty-one million, four hundred thirty-one thousand, two hundred sixty-one".