1601007209 has 4 divisors (see below), whose sum is σ = 1601100420. Its totient is φ = 1600914000.

The previous prime is 1601007197. The next prime is 1601007211. The reversal of 1601007209 is 9027001061.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 417303184 + 1183704025 = 20428^2 + 34405^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601007209 - 2¹⁶ = 1600941673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1601007229) 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, 12542 + ... + 57959.

It is an arithmetic number, because the mean of its divisors is an integer number (400275105).

Almost surely, 2^1601007209 is an apocalyptic number.

It is an amenable number.

1601007209 is a deficient number, since it is larger than the sum of its proper divisors (93211).

1601007209 is an equidigital number, since it uses as much as digits as its factorization.

1601007209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93210.

The product of its (nonzero) digits is 756, while the sum is 26.

The square root of 1601007209 is about 40012.5881317367. The cubic root of 1601007209 is about 1169.8524685529.

The spelling of 1601007209 in words is "one billion, six hundred one million, seven thousand, two hundred nine".