649591501 has 8 divisors (see below), whose sum is σ = 711029144. Its totient is φ = 589792320.

The previous prime is 649591493. The next prime is 649591511. The reversal of 649591501 is 105195946.

It can be written as a sum of positive squares in 4 ways, for example, as 106276 + 649485225 = 326^2 + 25485^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649591501 - 2³ = 649591493 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649591511) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408786 + ... + 410371.

It is an arithmetic number, because the mean of its divisors is an integer number (88878643).

Almost surely, 2^649591501 is an apocalyptic number.

649591501 is a gapful number since it is divisible by the number (61) formed by its first and last digit.

It is an amenable number.

649591501 is a deficient number, since it is larger than the sum of its proper divisors (61437643).

649591501 is a wasteful number, since it uses less digits than its factorization.

649591501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819231.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 649591501 is about 25487.0849843602. The cubic root of 649591501 is about 866.0576017703.

The spelling of 649591501 in words is "six hundred forty-nine million, five hundred ninety-one thousand, five hundred one".