509198401 has 4 divisors (see below), whose sum is σ = 518805972. Its totient is φ = 499590832.

The previous prime is 509198387. The next prime is 509198407. The reversal of 509198401 is 104891905.

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 261954225 + 247244176 = 16185^2 + 15724^2 .

It is a cyclic number.

It is not a de Polignac number, because 509198401 - 2⁵ = 509198369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509198407) 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, 4803706 + ... + 4803811.

It is an arithmetic number, because the mean of its divisors is an integer number (129701493).

Almost surely, 2^509198401 is an apocalyptic number.

It is an amenable number.

509198401 is a deficient number, since it is larger than the sum of its proper divisors (9607571).

509198401 is an equidigital number, since it uses as much as digits as its factorization.

509198401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9607570.

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 509198401 is about 22565.4249018271. The cubic root of 509198401 is about 798.5381642766.

The spelling of 509198401 in words is "five hundred nine million, one hundred ninety-eight thousand, four hundred one".