649536851 has 4 divisors (see below), whose sum is σ = 663356832. Its totient is φ = 635716872.

The previous prime is 649536847. The next prime is 649536911. The reversal of 649536851 is 158635946.

It is a happy number.

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 649536851 - 2² = 649536847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47), and also a Moran number because the ratio is a prime number: 13819933 = 649536851 / (6 + 4 + 9 + 5 + 3 + 6 + 8 + 5 + 1).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 649536796 and 649536805.

It is not an unprimeable number, because it can be changed into a prime (649536821) 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, 6909920 + ... + 6910013.

It is an arithmetic number, because the mean of its divisors is an integer number (165839208).

Almost surely, 2^649536851 is an apocalyptic number.

649536851 is a deficient number, since it is larger than the sum of its proper divisors (13819981).

649536851 is a wasteful number, since it uses less digits than its factorization.

649536851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13819980.

The product of its digits is 777600, while the sum is 47.

The square root of 649536851 is about 25486.0128501890. The cubic root of 649536851 is about 866.0333140063.

The spelling of 649536851 in words is "six hundred forty-nine million, five hundred thirty-six thousand, eight hundred fifty-one".