161227601 has 2 divisors, whose sum is σ = 161227602. Its totient is φ = 161227600.

The previous prime is 161227553. The next prime is 161227603. The reversal of 161227601 is 106722161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 154977601 + 6250000 = 12449^2 + 2500^2 .

It is a cyclic number.

It is not a de Polignac number, because 161227601 - 2²² = 157033297 is a prime.

Together with 161227603, 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 (161227603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80613800 + 80613801.

It is an arithmetic number, because the mean of its divisors is an integer number (80613801).

Almost surely, 2^161227601 is an apocalyptic number.

It is an amenable number.

161227601 is a deficient number, since it is larger than the sum of its proper divisors (1).

161227601 is an equidigital number, since it uses as much as digits as its factorization.

161227601 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 26.

The square root of 161227601 is about 12697.5431088065. The cubic root of 161227601 is about 544.2684132179.

Adding to 161227601 its reverse (106722161), we get a palindrome (267949762).

The spelling of 161227601 in words is "one hundred sixty-one million, two hundred twenty-seven thousand, six hundred one".