649196531 has 2 divisors, whose sum is σ = 649196532. Its totient is φ = 649196530.

The previous prime is 649196521. The next prime is 649196533. The reversal of 649196531 is 135691946.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649196531 is a prime.

It is a super-2 number, since 2×649196531² = 842912271724867922, which contains 22 as substring.

Together with 649196533, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (649196533) 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, 324598265 + 324598266.

It is an arithmetic number, because the mean of its divisors is an integer number (324598266).

Almost surely, 2^649196531 is an apocalyptic number.

649196531 is a deficient number, since it is larger than the sum of its proper divisors (1).

649196531 is an equidigital number, since it uses as much as digits as its factorization.

649196531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 44.

The square root of 649196531 is about 25479.3353720226. The cubic root of 649196531 is about 865.8820370127.

The spelling of 649196531 in words is "six hundred forty-nine million, one hundred ninety-six thousand, five hundred thirty-one".