161493265 has 8 divisors (see below), whose sum is σ = 193876200. Its totient is φ = 129138432.

The previous prime is 161493247. The next prime is 161493287. The reversal of 161493265 is 562394161.

It is a Cunningham number, because it is equal to 12708²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 1 + 161493264 = 1^2 + 12708^2 .

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 161493265 - 2²¹ = 159396113 is a prime.

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, 8911 + ... + 20059.

It is an arithmetic number, because the mean of its divisors is an integer number (24234525).

Almost surely, 2^161493265 is an apocalyptic number.

It is an amenable number.

161493265 is a deficient number, since it is larger than the sum of its proper divisors (32382935).

161493265 is a wasteful number, since it uses less digits than its factorization.

161493265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14051.

The product of its digits is 38880, while the sum is 37.

The square root of 161493265 is about 12708.0000393453. Note that the first 4 decimals coincide. The cubic root of 161493265 is about 544.5671899733.

The spelling of 161493265 in words is "one hundred sixty-one million, four hundred ninety-three thousand, two hundred sixty-five".