531361161 has 8 divisors (see below), whose sum is σ = 787201760. Its totient is φ = 354240756.

The previous prime is 531361147. The next prime is 531361169. The reversal of 531361161 is 161163135.

It is not a de Polignac number, because 531361161 - 2⁶ = 531361097 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 19680043 = 531361161 / (5 + 3 + 1 + 3 + 6 + 1 + 1 + 6 + 1).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531361169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9839995 + ... + 9840048.

It is an arithmetic number, because the mean of its divisors is an integer number (98400220).

Almost surely, 2^531361161 is an apocalyptic number.

It is an amenable number.

531361161 is a deficient number, since it is larger than the sum of its proper divisors (255840599).

531361161 is a wasteful number, since it uses less digits than its factorization.

531361161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19680052 (or 19680046 counting only the distinct ones).

The product of its digits is 1620, while the sum is 27.

The square root of 531361161 is about 23051.2724377636. The cubic root of 531361161 is about 809.9594355543.

The spelling of 531361161 in words is "five hundred thirty-one million, three hundred sixty-one thousand, one hundred sixty-one".