1202111609 has 2 divisors, whose sum is σ = 1202111610. Its totient is φ = 1202111608.

The previous prime is 1202111597. The next prime is 1202111641. The reversal of 1202111609 is 9061112021.

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., 1077677584 + 124434025 = 32828^2 + 11155^2 .

It is a cyclic number.

It is not a de Polignac number, because 1202111609 - 2¹⁶ = 1202046073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1202114609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 601055804 + 601055805.

It is an arithmetic number, because the mean of its divisors is an integer number (601055805).

Almost surely, 2^1202111609 is an apocalyptic number.

It is an amenable number.

1202111609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1202111609 is an equidigital number, since it uses as much as digits as its factorization.

1202111609 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 23.

The square root of 1202111609 is about 34671.4812057403. The cubic root of 1202111609 is about 1063.2815148756.

The spelling of 1202111609 in words is "one billion, two hundred two million, one hundred eleven thousand, six hundred nine".