161350409 has 4 divisors (see below), whose sum is σ = 176018640. Its totient is φ = 146682180.

The previous prime is 161350379. The next prime is 161350433. The reversal of 161350409 is 904053161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 904053161 = 11 ⋅82186651.

It is a cyclic number.

It is not a de Polignac number, because 161350409 - 2¹² = 161346313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161350439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7334099 + ... + 7334120.

It is an arithmetic number, because the mean of its divisors is an integer number (44004660).

Almost surely, 2^161350409 is an apocalyptic number.

It is an amenable number.

161350409 is a deficient number, since it is larger than the sum of its proper divisors (14668231).

161350409 is a wasteful number, since it uses less digits than its factorization.

161350409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14668230.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 161350409 is about 12702.3780844376. The cubic root of 161350409 is about 544.4065689495.

The spelling of 161350409 in words is "one hundred sixty-one million, three hundred fifty thousand, four hundred nine".