161336401 has 2 divisors, whose sum is σ = 161336402. Its totient is φ = 161336400.

The previous prime is 161336393. The next prime is 161336411. The reversal of 161336401 is 104633161.

It is a happy number.

161336401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140185600 + 21150801 = 11840^2 + 4599^2 .

It is a cyclic number.

It is not a de Polignac number, because 161336401 - 2³ = 161336393 is a prime.

It is not a weakly prime, because it can be changed into another prime (161336411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80668200 + 80668201.

It is an arithmetic number, because the mean of its divisors is an integer number (80668201).

Almost surely, 2^161336401 is an apocalyptic number.

It is an amenable number.

161336401 is a deficient number, since it is larger than the sum of its proper divisors (1).

161336401 is an equidigital number, since it uses as much as digits as its factorization.

161336401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 161336401 is about 12701.8266796552. The cubic root of 161336401 is about 544.3908138652.

Adding to 161336401 its reverse (104633161), we get a palindrome (265969562).

The spelling of 161336401 in words is "one hundred sixty-one million, three hundred thirty-six thousand, four hundred one".