616231531 has 4 divisors (see below), whose sum is σ = 616330552. Its totient is φ = 616132512.

The previous prime is 616231519. The next prime is 616231597. The reversal of 616231531 is 135132616.

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

It is a cyclic number.

It is not a de Polignac number, because 616231531 - 2¹¹ = 616229483 is a prime.

It is a super-2 number, since 2×616231531² = 759482599597207922, which contains 22 as substring.

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 616231531.

It is not an unprimeable number, because it can be changed into a prime (616231501) 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 3 ways as a sum of consecutive naturals, for example, 39501 + ... + 52846.

It is an arithmetic number, because the mean of its divisors is an integer number (154082638).

Almost surely, 2^616231531 is an apocalyptic number.

616231531 is a deficient number, since it is larger than the sum of its proper divisors (99021).

616231531 is an equidigital number, since it uses as much as digits as its factorization.

616231531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99020.

The product of its digits is 3240, while the sum is 28.

The square root of 616231531 is about 24824.0111786955. The cubic root of 616231531 is about 850.9707621768.

The spelling of 616231531 in words is "six hundred sixteen million, two hundred thirty-one thousand, five hundred thirty-one".