1601650509 has 8 divisors (see below), whose sum is σ = 2135909952. Its totient is φ = 1067579040.

The previous prime is 1601650459. The next prime is 1601650511. The reversal of 1601650509 is 9050561061.

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

It is not a de Polignac number, because 1601650509 - 2¹⁵ = 1601617741 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1601650509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601650549) 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, 25737 + ... + 62174.

It is an arithmetic number, because the mean of its divisors is an integer number (266988744).

Almost surely, 2^1601650509 is an apocalyptic number.

It is an amenable number.

1601650509 is a deficient number, since it is larger than the sum of its proper divisors (534259443).

1601650509 is an equidigital number, since it uses as much as digits as its factorization.

1601650509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93987.

The product of its (nonzero) digits is 8100, while the sum is 33.

The square root of 1601650509 is about 40020.6260445786. The cubic root of 1601650509 is about 1170.0091335396.

The spelling of 1601650509 in words is "one billion, six hundred one million, six hundred fifty thousand, five hundred nine".