649867331 has 4 divisors (see below), whose sum is σ = 659020464. Its totient is φ = 640714200.

The previous prime is 649867321. The next prime is 649867349. The reversal of 649867331 is 133768946.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 133768946 = 2 ⋅66884473.

It is a cyclic number.

It is not a de Polignac number, because 649867331 - 2²² = 645673027 is a prime.

It is a super-2 number, since 2×649867331² = 844655095802127122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649867301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4576460 + ... + 4576601.

It is an arithmetic number, because the mean of its divisors is an integer number (164755116).

Almost surely, 2^649867331 is an apocalyptic number.

649867331 is a deficient number, since it is larger than the sum of its proper divisors (9153133).

649867331 is an equidigital number, since it uses as much as digits as its factorization.

649867331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9153132.

The product of its digits is 653184, while the sum is 47.

The square root of 649867331 is about 25492.4955820335. The cubic root of 649867331 is about 866.1801664201.

The spelling of 649867331 in words is "six hundred forty-nine million, eight hundred sixty-seven thousand, three hundred thirty-one".