649231 has 4 divisors (see below), whose sum is σ = 708264. Its totient is φ = 590200.

The previous prime is 649217. The next prime is 649261. The reversal of 649231 is 132946.

649231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 649231 - 2⁹ = 648719 is a prime.

It is a super-2 number, since 2×649231² = 843001782722, which contains 22 as substring.

It is an Ulam number.

It is a pancake number, because a pancake can be divided into 649231 parts by 1139 straight cuts.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649196 and 649205.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649231.

It is not an unprimeable number, because it can be changed into a prime (649261) 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, 29500 + ... + 29521.

It is an arithmetic number, because the mean of its divisors is an integer number (177066).

2⁶⁴⁹²³¹ is an apocalyptic number.

649231 is a deficient number, since it is larger than the sum of its proper divisors (59033).

649231 is a wasteful number, since it uses less digits than its factorization.

649231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59032.

The product of its digits is 1296, while the sum is 25.

The square root of 649231 is about 805.7487201355. The cubic root of 649231 is about 86.5897361371.

The spelling of 649231 in words is "six hundred forty-nine thousand, two hundred thirty-one".