649129331 has 2 divisors, whose sum is σ = 649129332. Its totient is φ = 649129330.

The previous prime is 649129307. The next prime is 649129339. The reversal of 649129331 is 133921946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649129331 - 2¹⁰ = 649128307 is a prime.

It is a super-2 number, since 2×649129331² = 842737776729015122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (649129339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324564665 + 324564666.

It is an arithmetic number, because the mean of its divisors is an integer number (324564666).

Almost surely, 2^649129331 is an apocalyptic number.

649129331 is a deficient number, since it is larger than the sum of its proper divisors (1).

649129331 is an equidigital number, since it uses as much as digits as its factorization.

649129331 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 38.

The square root of 649129331 is about 25478.0166221784. The cubic root of 649129331 is about 865.8521594241.

The spelling of 649129331 in words is "six hundred forty-nine million, one hundred twenty-nine thousand, three hundred thirty-one".