649929531 has 16 divisors (see below), whose sum is σ = 900007200. Its totient is φ = 416832768.

The previous prime is 649929529. The next prime is 649929559. The reversal of 649929531 is 135929946.

It is not a de Polignac number, because 649929531 - 2¹ = 649929529 is a prime.

It is a super-2 number, since 2×649929531² = 844816790531759922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (649929521) 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 in 15 ways as a sum of consecutive naturals, for example, 23016 + ... + 42773.

It is an arithmetic number, because the mean of its divisors is an integer number (56250450).

Almost surely, 2^649929531 is an apocalyptic number.

649929531 is a deficient number, since it is larger than the sum of its proper divisors (250077669).

649929531 is a wasteful number, since it uses less digits than its factorization.

649929531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65918.

The product of its digits is 524880, while the sum is 48.

The square root of 649929531 is about 25493.7155197119. The cubic root of 649929531 is about 866.2078001052.

The spelling of 649929531 in words is "six hundred forty-nine million, nine hundred twenty-nine thousand, five hundred thirty-one".