161896505 has 8 divisors (see below), whose sum is σ = 198794112. Its totient is φ = 126505008.

The previous prime is 161896499. The next prime is 161896507. The reversal of 161896505 is 505698161.

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 161896505 - 2⁴ = 161896489 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161896507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 376289 + ... + 376718.

It is an arithmetic number, because the mean of its divisors is an integer number (24849264).

Almost surely, 2^161896505 is an apocalyptic number.

It is an amenable number.

161896505 is a deficient number, since it is larger than the sum of its proper divisors (36897607).

161896505 is an equidigital number, since it uses as much as digits as its factorization.

161896505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753055.

The product of its (nonzero) digits is 64800, while the sum is 41.

The square root of 161896505 is about 12723.8557442310. The cubic root of 161896505 is about 545.0200649123.

The spelling of 161896505 in words is "one hundred sixty-one million, eight hundred ninety-six thousand, five hundred five".