649197 has 12 divisors (see below), whose sum is σ = 956124. Its totient is φ = 424320.

The previous prime is 649183. The next prime is 649217. The reversal of 649197 is 791946.

649197 is a `hidden beast` number, since 649 + 1 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 281961 + 367236 = 531^2 + 606^2 .

It is not a de Polignac number, because 649197 - 2⁷ = 649069 is a prime.

It is an Ulam number.

649197 is a lucky 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 649197.

It is not an unprimeable number, because it can be changed into a prime (649147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204 + ... + 1157.

It is an arithmetic number, because the mean of its divisors is an integer number (79677).

2⁶⁴⁹¹⁹⁷ is an apocalyptic number.

It is an amenable number.

649197 is a deficient number, since it is larger than the sum of its proper divisors (306927).

649197 is a wasteful number, since it uses less digits than its factorization.

649197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1420 (or 1417 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 649197 is about 805.7276214702. The cubic root of 649197 is about 86.5882245526.

It can be divided in two parts, 64 and 9197, that added together give a cube (9261 = 21³).

The spelling of 649197 in words is "six hundred forty-nine thousand, one hundred ninety-seven".