649149481 has 2 divisors, whose sum is σ = 649149482. Its totient is φ = 649149480.

The previous prime is 649149443. The next prime is 649149509. The reversal of 649149481 is 184941946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 633277225 + 15872256 = 25165^2 + 3984^2 .

It is a cyclic number.

It is not a de Polignac number, because 649149481 - 2¹⁹ = 648625193 is a prime.

It is a super-2 number, since 2×649149481² = 842790097365138722, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649149581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324574740 + 324574741.

It is an arithmetic number, because the mean of its divisors is an integer number (324574741).

Almost surely, 2^649149481 is an apocalyptic number.

It is an amenable number.

649149481 is a deficient number, since it is larger than the sum of its proper divisors (1).

649149481 is an equidigital number, since it uses as much as digits as its factorization.

649149481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 46.

The square root of 649149481 is about 25478.4120580542. The cubic root of 649149481 is about 865.8611184711.

The spelling of 649149481 in words is "six hundred forty-nine million, one hundred forty-nine thousand, four hundred eighty-one".