1230402161 has 2 divisors, whose sum is σ = 1230402162. Its totient is φ = 1230402160.

The previous prime is 1230402139. The next prime is 1230402163. The reversal of 1230402161 is 1612040321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 718240000 + 512162161 = 26800^2 + 22631^2 .

It is an emirp because it is prime and its reverse (1612040321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1230402161 is a prime.

Together with 1230402163, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1230402163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615201080 + 615201081.

It is an arithmetic number, because the mean of its divisors is an integer number (615201081).

Almost surely, 2^1230402161 is an apocalyptic number.

It is an amenable number.

1230402161 is a deficient number, since it is larger than the sum of its proper divisors (1).

1230402161 is an equidigital number, since it uses as much as digits as its factorization.

1230402161 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1230402161 is about 35077.0888330260. The cubic root of 1230402161 is about 1071.5580298370.

Adding to 1230402161 its reverse (1612040321), we get a palindrome (2842442482).

The spelling of 1230402161 in words is "one billion, two hundred thirty million, four hundred two thousand, one hundred sixty-one".