161874005 has 4 divisors (see below), whose sum is σ = 194248812. Its totient is φ = 129499200.

The previous prime is 161873953. The next prime is 161874007. The reversal of 161874005 is 500478161.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 86843761 + 75030244 = 9319^2 + 8662^2 .

It is not a de Polignac number, because 161874005 - 2²⁰ = 160825429 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 (161874007) 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, 16187396 + ... + 16187405.

It is an arithmetic number, because the mean of its divisors is an integer number (48562203).

Almost surely, 2^161874005 is an apocalyptic number.

It is an amenable number.

161874005 is a deficient number, since it is larger than the sum of its proper divisors (32374807).

161874005 is an equidigital number, since it uses as much as digits as its factorization.

161874005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32374806.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 161874005 is about 12722.9715475592. The cubic root of 161874005 is about 544.9948152019.

The spelling of 161874005 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, five".