649161 has 8 divisors (see below), whose sum is σ = 961760. Its totient is φ = 432756.

The previous prime is 649157. The next prime is 649183. The reversal of 649161 is 161946.

649161 is a `hidden beast` number, since 649 + 16 + 1 = 666.

It is not a de Polignac number, because 649161 - 2² = 649157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 24043 = 649161 / (6 + 4 + 9 + 1 + 6 + 1).

It is a Duffinian number.

649161 is a lucky number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 649161.

It is not an unprimeable number, because it can be changed into a prime (649141) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11995 + ... + 12048.

It is an arithmetic number, because the mean of its divisors is an integer number (120220).

2⁶⁴⁹¹⁶¹ is an apocalyptic number.

It is an amenable number.

649161 is a deficient number, since it is larger than the sum of its proper divisors (312599).

649161 is a wasteful number, since it uses less digits than its factorization.

649161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24052 (or 24046 counting only the distinct ones).

The product of its digits is 1296, while the sum is 27.

The square root of 649161 is about 805.7052811047. The cubic root of 649161 is about 86.5866239939.

The spelling of 649161 in words is "six hundred forty-nine thousand, one hundred sixty-one".