2531043161 has 4 divisors (see below), whose sum is σ = 2531557092. Its totient is φ = 2530529232.

The previous prime is 2531043139. The next prime is 2531043173. The reversal of 2531043161 is 1613401352.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 889172761 + 1641870400 = 29819^2 + 40520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2531043161 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 2531043161.

It is not an unprimeable number, because it can be changed into a prime (2531043101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 249506 + ... + 259451.

It is an arithmetic number, because the mean of its divisors is an integer number (632889273).

Almost surely, 2^2531043161 is an apocalyptic number.

It is an amenable number.

2531043161 is a deficient number, since it is larger than the sum of its proper divisors (513931).

2531043161 is an equidigital number, since it uses as much as digits as its factorization.

2531043161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513930.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 2531043161 is about 50309.4738692426. The cubic root of 2531043161 is about 1362.8033224864.

The spelling of 2531043161 in words is "two billion, five hundred thirty-one million, forty-three thousand, one hundred sixty-one".