161292865 has 8 divisors (see below), whose sum is σ = 194356008. Its totient is φ = 128497920.

The previous prime is 161292853. The next prime is 161292913. The reversal of 161292865 is 568292161.

It can be written as a sum of positive squares in 4 ways, for example, as 67125249 + 94167616 = 8193^2 + 9704^2 .

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

It is not a de Polignac number, because 161292865 - 2²¹ = 159195713 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65722 + ... + 68131.

It is an arithmetic number, because the mean of its divisors is an integer number (24294501).

Almost surely, 2^161292865 is an apocalyptic number.

It is an amenable number.

161292865 is a deficient number, since it is larger than the sum of its proper divisors (33063143).

161292865 is a wasteful number, since it uses less digits than its factorization.

161292865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134099.

The product of its digits is 51840, while the sum is 40.

The square root of 161292865 is about 12700.1127947747. The cubic root of 161292865 is about 544.3418422124.

The spelling of 161292865 in words is "one hundred sixty-one million, two hundred ninety-two thousand, eight hundred sixty-five".