531889381 has 4 divisors (see below), whose sum is σ = 531991872. Its totient is φ = 531786892.

The previous prime is 531889373. The next prime is 531889409. The reversal of 531889381 is 183988135.

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, and also an emirpimes, since its reverse is a distinct semiprime: 183988135 = 5 ⋅36797627.

It is a cyclic number.

It is not a de Polignac number, because 531889381 - 2³ = 531889373 is a prime.

It is a super-2 number, since 2×531889381² = 565812627241126322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531889301) 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, 43021 + ... + 53986.

It is an arithmetic number, because the mean of its divisors is an integer number (132997968).

Almost surely, 2^531889381 is an apocalyptic number.

It is an amenable number.

531889381 is a deficient number, since it is larger than the sum of its proper divisors (102491).

531889381 is an equidigital number, since it uses as much as digits as its factorization.

531889381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102490.

The product of its digits is 207360, while the sum is 46.

The square root of 531889381 is about 23062.7270937329. The cubic root of 531889381 is about 810.2277371123.

The spelling of 531889381 in words is "five hundred thirty-one million, eight hundred eighty-nine thousand, three hundred eighty-one".