208969157 has 6 divisors (see below), whose sum is σ = 216424338. Its totient is φ = 201762512.

The previous prime is 208969139. The next prime is 208969177. The reversal of 208969157 is 751969802.

It can be written as a sum of positive squares in 3 ways, for example, as 73805281 + 135163876 = 8591^2 + 11626^2 .

It is not a de Polignac number, because 208969157 - 2¹⁶ = 208903621 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 (208969177) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 123398 + ... + 125079.

It is an arithmetic number, because the mean of its divisors is an integer number (36070723).

Almost surely, 2^208969157 is an apocalyptic number.

It is an amenable number.

208969157 is a deficient number, since it is larger than the sum of its proper divisors (7455181).

208969157 is an equidigital number, since it uses as much as digits as its factorization.

208969157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248535 (or 248506 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 208969157 is about 14455.7655279823. The cubic root of 208969157 is about 593.4180201120.

The spelling of 208969157 in words is "two hundred eight million, nine hundred sixty-nine thousand, one hundred fifty-seven".