531949133881 has 4 divisors (see below), whose sum is σ = 580308146064. Its totient is φ = 483590121700.

The previous prime is 531949133873. The next prime is 531949133917. The reversal of 531949133881 is 188331949135.

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 531949133881 - 2³ = 531949133873 is a prime.

It is a super-2 number, since 2×531949133881² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531949133801) 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, 24179506075 + ... + 24179506096.

It is an arithmetic number, because the mean of its divisors is an integer number (145077036516).

Almost surely, 2^531949133881 is an apocalyptic number.

It is an amenable number.

531949133881 is a deficient number, since it is larger than the sum of its proper divisors (48359012183).

531949133881 is a wasteful number, since it uses less digits than its factorization.

531949133881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48359012182.

The product of its digits is 2799360, while the sum is 55.

The spelling of 531949133881 in words is "five hundred thirty-one billion, nine hundred forty-nine million, one hundred thirty-three thousand, eight hundred eighty-one".