648149 has 4 divisors (see below), whose sum is σ = 649836. Its totient is φ = 646464.

The previous prime is 648133. The next prime is 648173. The reversal of 648149 is 941846.

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 552049 + 96100 = 743^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 648149 - 2⁴ = 648133 is a prime.

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 648149.

It is not an unprimeable number, because it can be changed into a prime (648119) 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, 47 + ... + 1139.

It is an arithmetic number, because the mean of its divisors is an integer number (162459).

2⁶⁴⁸¹⁴⁹ is an apocalyptic number.

It is an amenable number.

648149 is a deficient number, since it is larger than the sum of its proper divisors (1687).

648149 is a wasteful number, since it uses less digits than its factorization.

648149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its digits is 6912, while the sum is 32.

The square root of 648149 is about 805.0770149495. The cubic root of 648149 is about 86.5416062776.

It can be divided in two parts, 648 and 149, that added together give a palindrome (797).

The spelling of 648149 in words is "six hundred forty-eight thousand, one hundred forty-nine".