161489465 has 4 divisors (see below), whose sum is σ = 193787364. Its totient is φ = 129191568.

The previous prime is 161489459. The next prime is 161489473. The reversal of 161489465 is 564984161.

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 126585001 + 34904464 = 11251^2 + 5908^2 .

It is a cyclic number.

It is not a de Polignac number, because 161489465 - 2⁶ = 161489401 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16148942 + ... + 16148951.

It is an arithmetic number, because the mean of its divisors is an integer number (48446841).

Almost surely, 2^161489465 is an apocalyptic number.

It is an amenable number.

161489465 is a deficient number, since it is larger than the sum of its proper divisors (32297899).

161489465 is an equidigital number, since it uses as much as digits as its factorization.

161489465 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32297898.

The product of its digits is 207360, while the sum is 44.

The square root of 161489465 is about 12707.8505263479. The cubic root of 161489465 is about 544.5629186465.

The spelling of 161489465 in words is "one hundred sixty-one million, four hundred eighty-nine thousand, four hundred sixty-five".