208315261 has 32 divisors (see below), whose sum is σ = 266342400. Its totient is φ = 158241600.

The previous prime is 208315243. The next prime is 208315267. The reversal of 208315261 is 162513802.

It is not a de Polignac number, because 208315261 - 2¹¹ = 208313213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208315267) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 768556 + ... + 768826.

It is an arithmetic number, because the mean of its divisors is an integer number (8323200).

Almost surely, 2^208315261 is an apocalyptic number.

It is an amenable number.

208315261 is a deficient number, since it is larger than the sum of its proper divisors (58027139).

208315261 is a wasteful number, since it uses less digits than its factorization.

208315261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505.

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 208315261 is about 14433.1306721723. The cubic root of 208315261 is about 592.7984085563.

The spelling of 208315261 in words is "two hundred eight million, three hundred fifteen thousand, two hundred sixty-one".