208081957 has 2 divisors, whose sum is σ = 208081958. Its totient is φ = 208081956.

The previous prime is 208081903. The next prime is 208081997. The reversal of 208081957 is 759180802.

It is an a-pointer prime, because the next prime (208081997) can be obtained adding 208081957 to its sum of digits (40).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112550881 + 95531076 = 10609^2 + 9774^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-208081957 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 (208081997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104040978 + 104040979.

It is an arithmetic number, because the mean of its divisors is an integer number (104040979).

Almost surely, 2^208081957 is an apocalyptic number.

It is an amenable number.

208081957 is a deficient number, since it is larger than the sum of its proper divisors (1).

208081957 is an equidigital number, since it uses as much as digits as its factorization.

208081957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 208081957 is about 14425.0461697701. The cubic root of 208081957 is about 592.5770231071.

The spelling of 208081957 in words is "two hundred eight million, eighty-one thousand, nine hundred fifty-seven".