531116921 has 8 divisors (see below), whose sum is σ = 542085120. Its totient is φ = 520255008.

The previous prime is 531116903. The next prime is 531116923. The reversal of 531116921 is 129611135.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 531116921 - 2⁶ = 531116857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (531116923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16436 + ... + 36501.

It is an arithmetic number, because the mean of its divisors is an integer number (67760640).

Almost surely, 2^531116921 is an apocalyptic number.

It is an amenable number.

531116921 is a deficient number, since it is larger than the sum of its proper divisors (10968199).

531116921 is a wasteful number, since it uses less digits than its factorization.

531116921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53143.

The product of its digits is 1620, while the sum is 29.

The square root of 531116921 is about 23045.9740735774. The cubic root of 531116921 is about 809.8353173307.

The spelling of 531116921 in words is "five hundred thirty-one million, one hundred sixteen thousand, nine hundred twenty-one".