649429537 has 4 divisors (see below), whose sum is σ = 650705940. Its totient is φ = 648153136.

The previous prime is 649429531. The next prime is 649429553. The reversal of 649429537 is 735924946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 461218576 + 188210961 = 21476^2 + 13719^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-649429537 is a prime.

It is a Smith number, since the sum of its digits (49) 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 not an unprimeable number, because it can be changed into a prime (649429531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 637438 + ... + 638455.

It is an arithmetic number, because the mean of its divisors is an integer number (162676485).

Almost surely, 2^649429537 is an apocalyptic number.

It is an amenable number.

649429537 is a deficient number, since it is larger than the sum of its proper divisors (1276403).

649429537 is a wasteful number, since it uses less digits than its factorization.

649429537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276402.

The product of its digits is 1632960, while the sum is 49.

The square root of 649429537 is about 25483.9074123259. The cubic root of 649429537 is about 865.9856171396.

The spelling of 649429537 in words is "six hundred forty-nine million, four hundred twenty-nine thousand, five hundred thirty-seven".