1201400309 has 2 divisors, whose sum is σ = 1201400310. Its totient is φ = 1201400308.

The previous prime is 1201400297. The next prime is 1201400329. The reversal of 1201400309 is 9030041021.

It is an a-pointer prime, because the next prime (1201400329) can be obtained adding 1201400309 to its sum of digits (20).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 897002500 + 304397809 = 29950^2 + 17447^2 .

It is an emirp because it is prime and its reverse (9030041021) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1201400309 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1201400329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600700154 + 600700155.

It is an arithmetic number, because the mean of its divisors is an integer number (600700155).

Almost surely, 2^1201400309 is an apocalyptic number.

It is an amenable number.

1201400309 is a deficient number, since it is larger than the sum of its proper divisors (1).

1201400309 is an equidigital number, since it uses as much as digits as its factorization.

1201400309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 1201400309 is about 34661.2219778819. The cubic root of 1201400309 is about 1063.0717558269.

The spelling of 1201400309 in words is "one billion, two hundred one million, four hundred thousand, three hundred nine".