523255731421 has 2 divisors, whose sum is σ = 523255731422. Its totient is φ = 523255731420.

The previous prime is 523255731391. The next prime is 523255731553. The reversal of 523255731421 is 124137552325.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 482449711396 + 40806020025 = 694586^2 + 202005^2 .

It is a cyclic number.

It is not a de Polignac number, because 523255731421 - 2⁵ = 523255731389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (523255731221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 261627865710 + 261627865711.

It is an arithmetic number, because the mean of its divisors is an integer number (261627865711).

Almost surely, 2^523255731421 is an apocalyptic number.

It is an amenable number.

523255731421 is a deficient number, since it is larger than the sum of its proper divisors (1).

523255731421 is an equidigital number, since it uses as much as digits as its factorization.

523255731421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 252000, while the sum is 40.

The spelling of 523255731421 in words is "five hundred twenty-three billion, two hundred fifty-five million, seven hundred thirty-one thousand, four hundred twenty-one".