649239761 has 2 divisors, whose sum is σ = 649239762. Its totient is φ = 649239760.

The previous prime is 649239743. The next prime is 649239779. The reversal of 649239761 is 167932946.

It is a happy number.

649239761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a balanced prime because it is at equal distance from previous prime (649239743) and next prime (649239779).

It can be written as a sum of positive squares in only one way, i.e., 348009025 + 301230736 = 18655^2 + 17356^2 .

It is a cyclic number.

It is not a de Polignac number, because 649239761 - 2¹⁸ = 648977617 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649239161) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324619880 + 324619881.

It is an arithmetic number, because the mean of its divisors is an integer number (324619881).

Almost surely, 2^649239761 is an apocalyptic number.

It is an amenable number.

649239761 is a deficient number, since it is larger than the sum of its proper divisors (1).

649239761 is an equidigital number, since it uses as much as digits as its factorization.

649239761 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 649239761 is about 25480.1836924305. The cubic root of 649239761 is about 865.9012562824.

The spelling of 649239761 in words is "six hundred forty-nine million, two hundred thirty-nine thousand, seven hundred sixty-one".