209801461 has 2 divisors, whose sum is σ = 209801462. Its totient is φ = 209801460.

The previous prime is 209801453. The next prime is 209801479. The reversal of 209801461 is 164108902.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 198951025 + 10850436 = 14105^2 + 3294^2 .

It is a cyclic number.

It is not a de Polignac number, because 209801461 - 2³ = 209801453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209801411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104900730 + 104900731.

It is an arithmetic number, because the mean of its divisors is an integer number (104900731).

Almost surely, 2^209801461 is an apocalyptic number.

It is an amenable number.

209801461 is a deficient number, since it is larger than the sum of its proper divisors (1).

209801461 is an equidigital number, since it uses as much as digits as its factorization.

209801461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 209801461 is about 14484.5248800228. The cubic root of 209801461 is about 594.2048187026.

The spelling of 209801461 in words is "two hundred nine million, eight hundred one thousand, four hundred sixty-one".