250197038809 has 3 divisors (see below), whose sum is σ = 250197539007. Its totient is φ = 250196538612.

The previous prime is 250197038803. The next prime is 250197038821. The reversal of 250197038809 is 908830791052.

The square root of 250197038809 is 500197.

It is a perfect power (a square), and thus also a powerful number.

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 only one way, i.e., 64411902025 + 185785136784 = 253795^2 + 431028^2 .

It is not a de Polignac number, because 250197038809 - 2¹³ = 250197030617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (250197038803) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 250099 + ... + 750295.

It is an arithmetic number, because the mean of its divisors is an integer number (83399179669).

Almost surely, 2^250197038809 is an apocalyptic number.

250197038809 is the 500197-th square number.

250197038809 is the 250099-th centered octagonal number.

It is an amenable number.

250197038809 is a deficient number, since it is larger than the sum of its proper divisors (500198).

250197038809 is an frugal number, since it uses more digits than its factorization.

250197038809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1000394 (or 500197 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 250197038809 in words is "two hundred fifty billion, one hundred ninety-seven million, thirty-eight thousand, eight hundred nine".