649444751 has 2 divisors, whose sum is σ = 649444752. Its totient is φ = 649444750.

The previous prime is 649444703. The next prime is 649444753. The reversal of 649444751 is 157444946.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 649444751 - 2¹⁰ = 649443727 is a prime.

Together with 649444753, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649444753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324722375 + 324722376.

It is an arithmetic number, because the mean of its divisors is an integer number (324722376).

Almost surely, 2^649444751 is an apocalyptic number.

649444751 is a deficient number, since it is larger than the sum of its proper divisors (1).

649444751 is an equidigital number, since it uses as much as digits as its factorization.

649444751 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 483840, while the sum is 44.

The square root of 649444751 is about 25484.2059126825. The cubic root of 649444751 is about 865.9923794859.

The spelling of 649444751 in words is "six hundred forty-nine million, four hundred forty-four thousand, seven hundred fifty-one".