531971287 has 2 divisors, whose sum is σ = 531971288. Its totient is φ = 531971286.

The previous prime is 531971281. The next prime is 531971299. The reversal of 531971287 is 782179135.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-531971287 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531971281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265985643 + 265985644.

It is an arithmetic number, because the mean of its divisors is an integer number (265985644).

Almost surely, 2^531971287 is an apocalyptic number.

531971287 is a deficient number, since it is larger than the sum of its proper divisors (1).

531971287 is an equidigital number, since it uses as much as digits as its factorization.

531971287 is an evil number, because the sum of its binary digits is even.

The product of its digits is 105840, while the sum is 43.

The square root of 531971287 is about 23064.5027477290. The cubic root of 531971287 is about 810.2693241473.

The spelling of 531971287 in words is "five hundred thirty-one million, nine hundred seventy-one thousand, two hundred eighty-seven".