161503445 has 8 divisors (see below), whose sum is σ = 193878744. Its totient is φ = 129153024.

The previous prime is 161503429. The next prime is 161503453. The reversal of 161503445 is 544305161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 61009 + 161442436 = 247^2 + 12706^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 161503445 - 2⁴ = 161503429 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14117 + ... + 22853.

It is an arithmetic number, because the mean of its divisors is an integer number (24234843).

Almost surely, 2^161503445 is an apocalyptic number.

It is an amenable number.

161503445 is a deficient number, since it is larger than the sum of its proper divisors (32375299).

161503445 is an equidigital number, since it uses as much as digits as its factorization.

161503445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12439.

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

The square root of 161503445 is about 12708.4005681282. The cubic root of 161503445 is about 544.5786323030.

The spelling of 161503445 in words is "one hundred sixty-one million, five hundred three thousand, four hundred forty-five".