161314421 has 6 divisors (see below), whose sum is σ = 166686966. Its totient is φ = 156109800.

The previous prime is 161314381. The next prime is 161314423. The reversal of 161314421 is 124413161.

It can be written as a sum of positive squares in only one way, i.e., 158407396 + 2907025 = 12586^2 + 1705^2 .

It is not a de Polignac number, because 161314421 - 2¹⁴ = 161298037 is a prime.

It is a super-3 number, since 3×161314421³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161314423) 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 in 5 ways as a sum of consecutive naturals, for example, 82970 + ... + 84891.

It is an arithmetic number, because the mean of its divisors is an integer number (27781161).

Almost surely, 2^161314421 is an apocalyptic number.

It is an amenable number.

161314421 is a deficient number, since it is larger than the sum of its proper divisors (5372545).

161314421 is an equidigital number, since it uses as much as digits as its factorization.

161314421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167923 (or 167892 counting only the distinct ones).

The product of its digits is 576, while the sum is 23.

The square root of 161314421 is about 12700.9614203020. The cubic root of 161314421 is about 544.3660906710.

Adding to 161314421 its reverse (124413161), we get a palindrome (285727582).

The spelling of 161314421 in words is "one hundred sixty-one million, three hundred fourteen thousand, four hundred twenty-one".