161152865 has 4 divisors (see below), whose sum is σ = 193383444. Its totient is φ = 128922288.

The previous prime is 161152861. The next prime is 161152891. The reversal of 161152865 is 568251161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 568251161 = 4801 ⋅118361.

It can be written as a sum of positive squares in 2 ways, for example, as 83923921 + 77228944 = 9161^2 + 8788^2 .

It is a cyclic number.

It is not a de Polignac number, because 161152865 - 2² = 161152861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161152861) 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, 16115282 + ... + 16115291.

It is an arithmetic number, because the mean of its divisors is an integer number (48345861).

Almost surely, 2^161152865 is an apocalyptic number.

It is an amenable number.

161152865 is a deficient number, since it is larger than the sum of its proper divisors (32230579).

161152865 is an equidigital number, since it uses as much as digits as its factorization.

161152865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32230578.

The product of its digits is 14400, while the sum is 35.

The square root of 161152865 is about 12694.5998361508. The cubic root of 161152865 is about 544.1843028658.

The spelling of 161152865 in words is "one hundred sixty-one million, one hundred fifty-two thousand, eight hundred sixty-five".