531609887 has 2 divisors, whose sum is σ = 531609888. Its totient is φ = 531609886.

The previous prime is 531609847. The next prime is 531609901. The reversal of 531609887 is 788906135.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 531609887 - 2⁶ = 531609823 is a prime.

It is a super-3 number, since 3×531609887³ (a number of 27 digits) contains 333 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (531609847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 265804943 + 265804944.

It is an arithmetic number, because the mean of its divisors is an integer number (265804944).

Almost surely, 2^531609887 is an apocalyptic number.

531609887 is a deficient number, since it is larger than the sum of its proper divisors (1).

531609887 is an equidigital number, since it uses as much as digits as its factorization.

531609887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 47.

The square root of 531609887 is about 23056.6668666570. Note that the first 3 decimals coincide. The cubic root of 531609887 is about 810.0857943977.

The spelling of 531609887 in words is "five hundred thirty-one million, six hundred nine thousand, eight hundred eighty-seven".