649167877 has 2 divisors, whose sum is σ = 649167878. Its totient is φ = 649167876.

The previous prime is 649167859. The next prime is 649167913. The reversal of 649167877 is 778761946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 560695041 + 88472836 = 23679^2 + 9406^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649167877 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649167677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324583938 + 324583939.

It is an arithmetic number, because the mean of its divisors is an integer number (324583939).

Almost surely, 2^649167877 is an apocalyptic number.

It is an amenable number.

649167877 is a deficient number, since it is larger than the sum of its proper divisors (1).

649167877 is an equidigital number, since it uses as much as digits as its factorization.

649167877 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3556224, while the sum is 55.

The square root of 649167877 is about 25478.7730670062. The cubic root of 649167877 is about 865.8692974967.

The spelling of 649167877 in words is "six hundred forty-nine million, one hundred sixty-seven thousand, eight hundred seventy-seven".