161406445 has 8 divisors (see below), whose sum is σ = 194071320. Its totient is φ = 128869440.

The previous prime is 161406439. The next prime is 161406451. The reversal of 161406445 is 544604161.

It is an interprime number because it is at equal distance from previous prime (161406439) and next prime (161406451).

It can be written as a sum of positive squares in 4 ways, for example, as 14002564 + 147403881 = 3742^2 + 12141^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 161406445 - 2⁷ = 161406317 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29166 + ... + 34255.

It is an arithmetic number, because the mean of its divisors is an integer number (24258915).

Almost surely, 2^161406445 is an apocalyptic number.

It is an amenable number.

161406445 is a deficient number, since it is larger than the sum of its proper divisors (32664875).

161406445 is an equidigital number, since it uses as much as digits as its factorization.

161406445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63935.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 161406445 is about 12704.5836216698. The cubic root of 161406445 is about 544.4695846675.

The spelling of 161406445 in words is "one hundred sixty-one million, four hundred six thousand, four hundred forty-five".