263131455421 has 2 divisors, whose sum is σ = 263131455422. Its totient is φ = 263131455420.

The previous prime is 263131455343. The next prime is 263131455451. The reversal of 263131455421 is 124554131362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 262055943396 + 1075512025 = 511914^2 + 32795^2 .

It is a cyclic number.

It is not a de Polignac number, because 263131455421 - 2²³ = 263123066813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (263131455451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 131565727710 + 131565727711.

It is an arithmetic number, because the mean of its divisors is an integer number (131565727711).

Almost surely, 2^263131455421 is an apocalyptic number.

It is an amenable number.

263131455421 is a deficient number, since it is larger than the sum of its proper divisors (1).

263131455421 is an equidigital number, since it uses as much as digits as its factorization.

263131455421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 37.

Adding to 263131455421 its reverse (124554131362), we get a palindrome (387685586783).

The spelling of 263131455421 in words is "two hundred sixty-three billion, one hundred thirty-one million, four hundred fifty-five thousand, four hundred twenty-one".