201430309 has 2 divisors, whose sum is σ = 201430310. Its totient is φ = 201430308.

The previous prime is 201430303. The next prime is 201430349. The reversal of 201430309 is 903034102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 156500100 + 44930209 = 12510^2 + 6703^2 .

It is a cyclic number.

It is not a de Polignac number, because 201430309 - 2⁵ = 201430277 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201430309.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201430303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100715154 + 100715155.

It is an arithmetic number, because the mean of its divisors is an integer number (100715155).

Almost surely, 2^201430309 is an apocalyptic number.

It is an amenable number.

201430309 is a deficient number, since it is larger than the sum of its proper divisors (1).

201430309 is an equidigital number, since it uses as much as digits as its factorization.

201430309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 201430309 is about 14192.6145935131. The cubic root of 201430309 is about 586.1943204636.

It can be divided in two parts, 2014 and 30309, that added together give a palindrome (32323).

The spelling of 201430309 in words is "two hundred one million, four hundred thirty thousand, three hundred nine".