658949 has 4 divisors (see below), whose sum is σ = 671436. Its totient is φ = 646464.

The previous prime is 658943. The next prime is 658961. The reversal of 658949 is 949856.

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

It can be written as a sum of positive squares in 2 ways, for example, as 268324 + 390625 = 518^2 + 625^2 .

It is a cyclic number.

It is not a de Polignac number, because 658949 - 2¹² = 654853 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

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 658949.

It is not an unprimeable number, because it can be changed into a prime (658943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6164 + ... + 6269.

It is an arithmetic number, because the mean of its divisors is an integer number (167859).

2⁶⁵⁸⁹⁴⁹ is an apocalyptic number.

It is an amenable number.

658949 is a deficient number, since it is larger than the sum of its proper divisors (12487).

658949 is a wasteful number, since it uses less digits than its factorization.

658949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12486.

The product of its digits is 77760, while the sum is 41.

The square root of 658949 is about 811.7567369600. The cubic root of 658949 is about 87.0196370875.

The spelling of 658949 in words is "six hundred fifty-eight thousand, nine hundred forty-nine".