531399161 has 8 divisors (see below), whose sum is σ = 550089480. Its totient is φ = 512733312.

The previous prime is 531399151. The next prime is 531399191. The reversal of 531399161 is 161993135.

It can be written as a sum of positive squares in 4 ways, for example, as 88717561 + 442681600 = 9419^2 + 21040^2 .

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 531399161 - 2²² = 527204857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531399131) 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 in 7 ways as a sum of consecutive naturals, for example, 45611 + ... + 56063.

It is an arithmetic number, because the mean of its divisors is an integer number (68761185).

Almost surely, 2^531399161 is an apocalyptic number.

It is an amenable number.

531399161 is a deficient number, since it is larger than the sum of its proper divisors (18690319).

531399161 is a wasteful number, since it uses less digits than its factorization.

531399161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12235.

The product of its digits is 21870, while the sum is 38.

The square root of 531399161 is about 23052.0966725372. The cubic root of 531399161 is about 809.9787430280.

The spelling of 531399161 in words is "five hundred thirty-one million, three hundred ninety-nine thousand, one hundred sixty-one".