531221244427 has 2 divisors, whose sum is σ = 531221244428. Its totient is φ = 531221244426.

The previous prime is 531221244419. The next prime is 531221244461. The reversal of 531221244427 is 724442122135.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 531221244427 - 2³ = 531221244419 is a prime.

It is a super-3 number, since 3×531221244427³ (a number of 36 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (531221244227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265610622213 + 265610622214.

It is an arithmetic number, because the mean of its divisors is an integer number (265610622214).

Almost surely, 2^531221244427 is an apocalyptic number.

531221244427 is a deficient number, since it is larger than the sum of its proper divisors (1).

531221244427 is an equidigital number, since it uses as much as digits as its factorization.

531221244427 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 107520, while the sum is 37.

The spelling of 531221244427 in words is "five hundred thirty-one billion, two hundred twenty-one million, two hundred forty-four thousand, four hundred twenty-seven".