208881557 has 2 divisors, whose sum is σ = 208881558. Its totient is φ = 208881556.

The previous prime is 208881553. The next prime is 208881581. The reversal of 208881557 is 755188802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108701476 + 100180081 = 10426^2 + 10009^2 .

It is a cyclic number.

It is not a de Polignac number, because 208881557 - 2² = 208881553 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (208881553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104440778 + 104440779.

It is an arithmetic number, because the mean of its divisors is an integer number (104440779).

Almost surely, 2^208881557 is an apocalyptic number.

It is an amenable number.

208881557 is a deficient number, since it is larger than the sum of its proper divisors (1).

208881557 is an equidigital number, since it uses as much as digits as its factorization.

208881557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 179200, while the sum is 44.

The square root of 208881557 is about 14452.7352774483. The cubic root of 208881557 is about 593.3350881220.

The spelling of 208881557 in words is "two hundred eight million, eight hundred eighty-one thousand, five hundred fifty-seven".