208972691 has 2 divisors, whose sum is σ = 208972692. Its totient is φ = 208972690.

The previous prime is 208972679. The next prime is 208972703. The reversal of 208972691 is 196279802.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (208972679) and next prime (208972703).

It is a cyclic number.

It is not a de Polignac number, because 208972691 - 2⁶ = 208972627 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (208972601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104486345 + 104486346.

It is an arithmetic number, because the mean of its divisors is an integer number (104486346).

Almost surely, 2^208972691 is an apocalyptic number.

208972691 is a deficient number, since it is larger than the sum of its proper divisors (1).

208972691 is an equidigital number, since it uses as much as digits as its factorization.

208972691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 44.

The square root of 208972691 is about 14455.8877624309. The cubic root of 208972691 is about 593.4213653065.

The spelling of 208972691 in words is "two hundred eight million, nine hundred seventy-two thousand, six hundred ninety-one".