306641 has 4 divisors (see below), whose sum is σ = 322800. Its totient is φ = 290484.

The previous prime is 306589. The next prime is 306643. The reversal of 306641 is 146603.

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.

It is a cyclic number.

It is not a de Polignac number, because 306641 - 2⁶ = 306577 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (306643) 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, 8051 + ... + 8088.

It is an arithmetic number, because the mean of its divisors is an integer number (80700).

2³⁰⁶⁶⁴¹ is an apocalyptic number.

It is an amenable number.

306641 is a deficient number, since it is larger than the sum of its proper divisors (16159).

306641 is a wasteful number, since it uses less digits than its factorization.

306641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16158.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 306641 is about 553.7517494329. The cubic root of 306641 is about 67.4336613902.

The spelling of 306641 in words is "three hundred six thousand, six hundred forty-one".