649431529 has 2 divisors, whose sum is σ = 649431530. Its totient is φ = 649431528.

The previous prime is 649431479. The next prime is 649431581. The reversal of 649431529 is 925134946.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 466560000 + 182871529 = 21600^2 + 13523^2 .

It is a cyclic number.

It is not a de Polignac number, because 649431529 - 2¹³ = 649423337 is a prime.

It is a super-2 number, since 2×649431529² = 843522621718555682, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (649435529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 324715764 + 324715765.

It is an arithmetic number, because the mean of its divisors is an integer number (324715765).

Almost surely, 2^649431529 is an apocalyptic number.

It is an amenable number.

649431529 is a deficient number, since it is larger than the sum of its proper divisors (1).

649431529 is an equidigital number, since it uses as much as digits as its factorization.

649431529 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 649431529 is about 25483.9464957844. The cubic root of 649431529 is about 865.9865025533.

The spelling of 649431529 in words is "six hundred forty-nine million, four hundred thirty-one thousand, five hundred twenty-nine".