531915493 has 2 divisors, whose sum is σ = 531915494. Its totient is φ = 531915492.

The previous prime is 531915491. The next prime is 531915557. The reversal of 531915493 is 394519135.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 516289284 + 15626209 = 22722^2 + 3953^2 .

It is a cyclic number.

It is not a de Polignac number, because 531915493 - 2¹ = 531915491 is a prime.

Together with 531915491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531915491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265957746 + 265957747.

It is an arithmetic number, because the mean of its divisors is an integer number (265957747).

Almost surely, 2^531915493 is an apocalyptic number.

It is an amenable number.

531915493 is a deficient number, since it is larger than the sum of its proper divisors (1).

531915493 is an equidigital number, since it uses as much as digits as its factorization.

531915493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72900, while the sum is 40.

The square root of 531915493 is about 23063.2931950318. The cubic root of 531915493 is about 810.2409957091.

The spelling of 531915493 in words is "five hundred thirty-one million, nine hundred fifteen thousand, four hundred ninety-three".