531897209 has 8 divisors (see below), whose sum is σ = 541406208. Its totient is φ = 522471600.

The previous prime is 531897193. The next prime is 531897211. The reversal of 531897209 is 902798135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 531897209 - 2⁴ = 531897193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 531897209.

It is not an unprimeable number, because it can be changed into a prime (531897239) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7907 + ... + 33560.

It is an arithmetic number, because the mean of its divisors is an integer number (67675776).

Almost surely, 2^531897209 is an apocalyptic number.

It is an amenable number.

531897209 is a deficient number, since it is larger than the sum of its proper divisors (9508999).

531897209 is a wasteful number, since it uses less digits than its factorization.

531897209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41695.

The product of its (nonzero) digits is 136080, while the sum is 44.

The square root of 531897209 is about 23062.8968041744. The cubic root of 531897209 is about 810.2317118935.

The spelling of 531897209 in words is "five hundred thirty-one million, eight hundred ninety-seven thousand, two hundred nine".