649372991 has 2 divisors, whose sum is σ = 649372992. Its totient is φ = 649372990.

The previous prime is 649372963. The next prime is 649373041. The reversal of 649372991 is 199273946.

It is an a-pointer prime, because the next prime (649373041) can be obtained adding 649372991 to its sum of digits (50).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 649372991 - 2¹⁴ = 649356607 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 (649372921) 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, 324686495 + 324686496.

It is an arithmetic number, because the mean of its divisors is an integer number (324686496).

Almost surely, 2^649372991 is an apocalyptic number.

649372991 is a deficient number, since it is larger than the sum of its proper divisors (1).

649372991 is an equidigital number, since it uses as much as digits as its factorization.

649372991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 649372991 is about 25482.7979429261. The cubic root of 649372991 is about 865.9604825452.

The spelling of 649372991 in words is "six hundred forty-nine million, three hundred seventy-two thousand, nine hundred ninety-one".