208622987 has 2 divisors, whose sum is σ = 208622988. Its totient is φ = 208622986.

The previous prime is 208622969. The next prime is 208623001. The reversal of 208622987 is 789226802.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 208622987 - 2⁸ = 208622731 is a prime.

It is not a weakly prime, because it can be changed into another prime (208622587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104311493 + 104311494.

It is an arithmetic number, because the mean of its divisors is an integer number (104311494).

Almost surely, 2^208622987 is an apocalyptic number.

208622987 is a deficient number, since it is larger than the sum of its proper divisors (1).

208622987 is an equidigital number, since it uses as much as digits as its factorization.

208622987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 208622987 is about 14443.7871418821. The cubic root of 208622987 is about 593.0901614371.

The spelling of 208622987 in words is "two hundred eight million, six hundred twenty-two thousand, nine hundred eighty-seven".