531556161 has 16 divisors (see below), whose sum is σ = 721493760. Its totient is φ = 348042240.

The previous prime is 531556121. The next prime is 531556169. The reversal of 531556161 is 161655135.

It is not a de Polignac number, because 531556161 - 2⁹ = 531555649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (531556169) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39931 + ... + 51551.

It is an arithmetic number, because the mean of its divisors is an integer number (45093360).

Almost surely, 2^531556161 is an apocalyptic number.

It is an amenable number.

531556161 is a deficient number, since it is larger than the sum of its proper divisors (189937599).

531556161 is a wasteful number, since it uses less digits than its factorization.

531556161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11896.

The product of its digits is 13500, while the sum is 33.

The square root of 531556161 is about 23055.5017512090. The cubic root of 531556161 is about 810.0585036238.

The spelling of 531556161 in words is "five hundred thirty-one million, five hundred fifty-six thousand, one hundred sixty-one".