161453405 has 4 divisors (see below), whose sum is σ = 193744092. Its totient is φ = 129162720.

The previous prime is 161453401. The next prime is 161453407. The reversal of 161453405 is 504354161.

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 33016516 + 128436889 = 5746^2 + 11333^2 .

It is not a de Polignac number, because 161453405 - 2² = 161453401 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 (161453401) 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 3 ways as a sum of consecutive naturals, for example, 16145336 + ... + 16145345.

It is an arithmetic number, because the mean of its divisors is an integer number (48436023).

Almost surely, 2^161453405 is an apocalyptic number.

It is an amenable number.

161453405 is a deficient number, since it is larger than the sum of its proper divisors (32290687).

161453405 is an equidigital number, since it uses as much as digits as its factorization.

161453405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32290686.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 161453405 is about 12706.4316391346. The cubic root of 161453405 is about 544.5223826676.

The spelling of 161453405 in words is "one hundred sixty-one million, four hundred fifty-three thousand, four hundred five".