306631 has 8 divisors (see below), whose sum is σ = 334880. Its totient is φ = 279072.

The previous prime is 306589. The next prime is 306643. The reversal of 306631 is 136603.

It is a happy number.

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 306631 - 2⁷ = 306503 is a prime.

It is a super-2 number, since 2×306631² = 188045140322, which contains 22 as substring.

It is a nialpdrome in base 13.

It is a junction number, because it is equal to n+sod(n) for n = 306599 and 306608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306661) 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 7 ways as a sum of consecutive naturals, for example, 1225 + ... + 1453.

It is an arithmetic number, because the mean of its divisors is an integer number (41860).

2³⁰⁶⁶³¹ is an apocalyptic number.

306631 is a deficient number, since it is larger than the sum of its proper divisors (28249).

306631 is a wasteful number, since it uses less digits than its factorization.

306631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 345.

The product of its (nonzero) digits is 324, while the sum is 19.

The square root of 306631 is about 553.7427200424. The cubic root of 306631 is about 67.4329283463.

The spelling of 306631 in words is "three hundred six thousand, six hundred thirty-one".