161398459 has 8 divisors (see below), whose sum is σ = 171045648. Its totient is φ = 151768320.

The previous prime is 161398421. The next prime is 161398463. The reversal of 161398459 is 954893161.

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 161398459 - 2⁹ = 161397947 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161398499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18864 + ... + 26050.

It is an arithmetic number, because the mean of its divisors is an integer number (21380706).

Almost surely, 2^161398459 is an apocalyptic number.

161398459 is a deficient number, since it is larger than the sum of its proper divisors (9647189).

161398459 is a wasteful number, since it uses less digits than its factorization.

161398459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8525.

The product of its digits is 233280, while the sum is 46.

The square root of 161398459 is about 12704.2693217674. The cubic root of 161398459 is about 544.4606048406.

The spelling of 161398459 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, four hundred fifty-nine".