161405141 has 4 divisors (see below), whose sum is σ = 161688384. Its totient is φ = 161121900.

The previous prime is 161405093. The next prime is 161405143. The reversal of 161405141 is 141504161.

It is a happy number.

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: 141504161 = 41 ⋅3451321.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161405141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161405143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140765 + ... + 141906.

It is an arithmetic number, because the mean of its divisors is an integer number (40422096).

Almost surely, 2^161405141 is an apocalyptic number.

It is an amenable number.

161405141 is a deficient number, since it is larger than the sum of its proper divisors (283243).

161405141 is an equidigital number, since it uses as much as digits as its factorization.

161405141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283242.

The product of its (nonzero) digits is 480, while the sum is 23.

The square root of 161405141 is about 12704.5323015056. The cubic root of 161405141 is about 544.4681184100.

The spelling of 161405141 in words is "one hundred sixty-one million, four hundred five thousand, one hundred forty-one".