208998261 has 18 divisors (see below), whose sum is σ = 307333442. Its totient is φ = 136825920.

The previous prime is 208998253. The next prime is 208998269. The reversal of 208998261 is 162899802.

It is an interprime number because it is at equal distance from previous prime (208998253) and next prime (208998269).

It can be written as a sum of positive squares in 3 ways, for example, as 52272900 + 156725361 = 7230^2 + 12519^2 .

It is not a de Polignac number, because 208998261 - 2³ = 208998253 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 (208998269) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 338425 + ... + 339041.

Almost surely, 2^208998261 is an apocalyptic number.

It is an amenable number.

208998261 is a deficient number, since it is larger than the sum of its proper divisors (98335181).

208998261 is an frugal number, since it uses more digits than its factorization.

208998261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301 (or 681 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 208998261 is about 14456.7721501032. The cubic root of 208998261 is about 593.4455680949.

The spelling of 208998261 in words is "two hundred eight million, nine hundred ninety-eight thousand, two hundred sixty-one".