616631 has 4 divisors (see below), whose sum is σ = 625152. Its totient is φ = 608112.

The previous prime is 616597. The next prime is 616639. The reversal of 616631 is 136616.

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 616631 - 2¹⁰ = 615607 is a prime.

It is a super-2 number, since 2×616631² = 760467580322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 616597 and 616606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4151 + ... + 4296.

It is an arithmetic number, because the mean of its divisors is an integer number (156288).

2⁶¹⁶⁶³¹ is an apocalyptic number.

616631 is a deficient number, since it is larger than the sum of its proper divisors (8521).

616631 is an equidigital number, since it uses as much as digits as its factorization.

616631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8520.

The product of its digits is 648, while the sum is 23.

The square root of 616631 is about 785.2585561457. The cubic root of 616631 is about 85.1154601635.

The spelling of 616631 in words is "six hundred sixteen thousand, six hundred thirty-one".