609688801 has 4 divisors (see below), whose sum is σ = 609739204. Its totient is φ = 609638400.

The previous prime is 609688763. The next prime is 609688813. The reversal of 609688801 is 108886906.

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 235653201 + 374035600 = 15351^2 + 19340^2 .

It is a 3-Lehmer number, since φ(609688801) divides (609688801-1)³.

It is a cyclic number.

It is not a de Polignac number, because 609688801 - 2¹³ = 609680609 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (609688861) 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, 5041 + ... + 35281.

It is an arithmetic number, because the mean of its divisors is an integer number (152434801).

Almost surely, 2^609688801 is an apocalyptic number.

609688801 is the 20161-st pentagonal number.

It is an amenable number.

609688801 is a deficient number, since it is larger than the sum of its proper divisors (50403).

609688801 is a wasteful number, since it uses less digits than its factorization.

609688801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50402.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 609688801 is about 24691.8772271369. The cubic root of 609688801 is about 847.9483626925.

The spelling of 609688801 in words is "six hundred nine million, six hundred eighty-eight thousand, eight hundred one".