649225 has 6 divisors (see below), whose sum is σ = 805070. Its totient is φ = 519360.

The previous prime is 649217. The next prime is 649261. The reversal of 649225 is 522946.

It can be written as a sum of positive squares in 3 ways, for example, as 2809 + 646416 = 53^2 + 804^2 .

It is not a de Polignac number, because 649225 - 2³ = 649217 is a prime.

649225 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 649193 and 649202.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12960 + ... + 13009.

2⁶⁴⁹²²⁵ is an apocalyptic number.

It is an amenable number.

649225 is a deficient number, since it is larger than the sum of its proper divisors (155845).

649225 is a wasteful number, since it uses less digits than its factorization.

649225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25979 (or 25974 counting only the distinct ones).

The product of its digits is 4320, while the sum is 28.

The square root of 649225 is about 805.7449968818. The cubic root of 649225 is about 86.5894693907.

The spelling of 649225 in words is "six hundred forty-nine thousand, two hundred twenty-five".