209730901 has 2 divisors, whose sum is σ = 209730902. Its totient is φ = 209730900.

The previous prime is 209730893. The next prime is 209730923. The reversal of 209730901 is 109037902.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107619876 + 102111025 = 10374^2 + 10105^2 .

It is a cyclic number.

It is not a de Polignac number, because 209730901 - 2³ = 209730893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209730401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104865450 + 104865451.

It is an arithmetic number, because the mean of its divisors is an integer number (104865451).

Almost surely, 2^209730901 is an apocalyptic number.

It is an amenable number.

209730901 is a deficient number, since it is larger than the sum of its proper divisors (1).

209730901 is an equidigital number, since it uses as much as digits as its factorization.

209730901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3402, while the sum is 31.

The square root of 209730901 is about 14482.0889722443. The cubic root of 209730901 is about 594.1381973153.

The spelling of 209730901 in words is "two hundred nine million, seven hundred thirty thousand, nine hundred one".