531649705 has 4 divisors (see below), whose sum is σ = 637979652. Its totient is φ = 425319760.

The previous prime is 531649691. The next prime is 531649733. The reversal of 531649705 is 507946135.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507946135 = 5 ⋅101589227.

It can be written as a sum of positive squares in 2 ways, for example, as 329640336 + 202009369 = 18156^2 + 14213^2 .

It is not a de Polignac number, because 531649705 - 2⁵ = 531649673 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53164966 + ... + 53164975.

It is an arithmetic number, because the mean of its divisors is an integer number (159494913).

Almost surely, 2^531649705 is an apocalyptic number.

It is an amenable number.

531649705 is a deficient number, since it is larger than the sum of its proper divisors (106329947).

531649705 is a wasteful number, since it uses less digits than its factorization.

531649705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106329946.

The product of its (nonzero) digits is 113400, while the sum is 40.

The square root of 531649705 is about 23057.5303317593. The cubic root of 531649705 is about 810.1060192478.

The spelling of 531649705 in words is "five hundred thirty-one million, six hundred forty-nine thousand, seven hundred five".