531161641 has 4 divisors (see below), whose sum is σ = 533942784. Its totient is φ = 528380500.

The previous prime is 531161633. The next prime is 531161723. The reversal of 531161641 is 146161135.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 531161641 - 2³ = 531161633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531161611) 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, 1390285 + ... + 1390666.

It is an arithmetic number, because the mean of its divisors is an integer number (133485696).

Almost surely, 2^531161641 is an apocalyptic number.

It is an amenable number.

531161641 is a deficient number, since it is larger than the sum of its proper divisors (2781143).

531161641 is a wasteful number, since it uses less digits than its factorization.

531161641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781142.

The product of its digits is 2160, while the sum is 28.

The square root of 531161641 is about 23046.9442876925. The cubic root of 531161641 is about 809.8580460479.

The spelling of 531161641 in words is "five hundred thirty-one million, one hundred sixty-one thousand, six hundred forty-one".