649161859 has 4 divisors (see below), whose sum is σ = 653518800. Its totient is φ = 644804920.

The previous prime is 649161797. The next prime is 649161883. The reversal of 649161859 is 958161946.

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

It is a cyclic number.

It is not a de Polignac number, because 649161859 - 2²³ = 640773251 is a prime.

It is a super-2 number, since 2×649161859² = 842822238360671762, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649161889) 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, 2178247 + ... + 2178544.

It is an arithmetic number, because the mean of its divisors is an integer number (163379700).

Almost surely, 2^649161859 is an apocalyptic number.

649161859 is a deficient number, since it is larger than the sum of its proper divisors (4356941).

649161859 is a wasteful number, since it uses less digits than its factorization.

649161859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4356940.

The product of its digits is 466560, while the sum is 49.

The square root of 649161859 is about 25478.6549684241. The cubic root of 649161859 is about 865.8666218572.

The spelling of 649161859 in words is "six hundred forty-nine million, one hundred sixty-one thousand, eight hundred fifty-nine".