649784177 has 4 divisors (see below), whose sum is σ = 742610496. Its totient is φ = 556957860.

The previous prime is 649784159. The next prime is 649784203. The reversal of 649784177 is 771487946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 771487946 = 2 ⋅385743973.

It is a cyclic number.

It is not a de Polignac number, because 649784177 - 2¹⁰ = 649783153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649784147) 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, 46413149 + ... + 46413162.

It is an arithmetic number, because the mean of its divisors is an integer number (185652624).

Almost surely, 2^649784177 is an apocalyptic number.

It is an amenable number.

649784177 is a deficient number, since it is larger than the sum of its proper divisors (92826319).

649784177 is an equidigital number, since it uses as much as digits as its factorization.

649784177 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92826318.

The product of its digits is 2370816, while the sum is 53.

The square root of 649784177 is about 25490.8645792959. The cubic root of 649784177 is about 866.1432207163.

The spelling of 649784177 in words is "six hundred forty-nine million, seven hundred eighty-four thousand, one hundred seventy-seven".