649392533 has 2 divisors, whose sum is σ = 649392534. Its totient is φ = 649392532.

The previous prime is 649392509. The next prime is 649392547. The reversal of 649392533 is 335293946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 434388964 + 215003569 = 20842^2 + 14663^2 .

It is a cyclic number.

It is not a de Polignac number, because 649392533 - 2⁸ = 649392277 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (649397533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324696266 + 324696267.

It is an arithmetic number, because the mean of its divisors is an integer number (324696267).

Almost surely, 2^649392533 is an apocalyptic number.

It is an amenable number.

649392533 is a deficient number, since it is larger than the sum of its proper divisors (1).

649392533 is an equidigital number, since it uses as much as digits as its factorization.

649392533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 44.

The square root of 649392533 is about 25483.1813751737. The cubic root of 649392533 is about 865.9691690937.

The spelling of 649392533 in words is "six hundred forty-nine million, three hundred ninety-two thousand, five hundred thirty-three".