209148481 has 4 divisors (see below), whose sum is σ = 209578432. Its totient is φ = 208718532.

The previous prime is 209148427. The next prime is 209148491. The reversal of 209148481 is 184841902.

209148481 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 209148481 - 2¹³ = 209140289 is a prime.

It is a super-2 number, since 2×209148481² = 87486174209214722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 209148481.

It is not an unprimeable number, because it can be changed into a prime (209148491) 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, 214245 + ... + 215218.

It is an arithmetic number, because the mean of its divisors is an integer number (52394608).

Almost surely, 2^209148481 is an apocalyptic number.

It is an amenable number.

209148481 is a deficient number, since it is larger than the sum of its proper divisors (429951).

209148481 is an equidigital number, since it uses as much as digits as its factorization.

209148481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429950.

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 209148481 is about 14461.9667058115. The cubic root of 209148481 is about 593.5877160770.

The spelling of 209148481 in words is "two hundred nine million, one hundred forty-eight thousand, four hundred eighty-one".