161343401 has 2 divisors, whose sum is σ = 161343402. Its totient is φ = 161343400.

The previous prime is 161343397. The next prime is 161343409. The reversal of 161343401 is 104343161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160782400 + 561001 = 12680^2 + 749^2 .

It is a cyclic number.

It is not a de Polignac number, because 161343401 - 2² = 161343397 is a prime.

It is not a weakly prime, because it can be changed into another prime (161343409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80671700 + 80671701.

It is an arithmetic number, because the mean of its divisors is an integer number (80671701).

Almost surely, 2^161343401 is an apocalyptic number.

It is an amenable number.

161343401 is a deficient number, since it is larger than the sum of its proper divisors (1).

161343401 is an equidigital number, since it uses as much as digits as its factorization.

161343401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 161343401 is about 12702.1022275842. The cubic root of 161343401 is about 544.3986870225.

Adding to 161343401 its reverse (104343161), we get a palindrome (265686562).

The spelling of 161343401 in words is "one hundred sixty-one million, three hundred forty-three thousand, four hundred one".