531915491 has 2 divisors, whose sum is σ = 531915492. Its totient is φ = 531915490.

The previous prime is 531915463. The next prime is 531915493. The reversal of 531915491 is 194519135.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531915491 is a prime.

Together with 531915493, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (531915493) 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, 265957745 + 265957746.

It is an arithmetic number, because the mean of its divisors is an integer number (265957746).

Almost surely, 2^531915491 is an apocalyptic number.

531915491 is a deficient number, since it is larger than the sum of its proper divisors (1).

531915491 is an equidigital number, since it uses as much as digits as its factorization.

531915491 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24300, while the sum is 38.

The square root of 531915491 is about 23063.2931516729. The cubic root of 531915491 is about 810.2409946936.

The spelling of 531915491 in words is "five hundred thirty-one million, nine hundred fifteen thousand, four hundred ninety-one".