161996459 has 4 divisors (see below), whose sum is σ = 162844800. Its totient is φ = 161148120.

The previous prime is 161996447. The next prime is 161996467. The reversal of 161996459 is 954699161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161996459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161996759) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 423884 + ... + 424265.

It is an arithmetic number, because the mean of its divisors is an integer number (40711200).

Almost surely, 2^161996459 is an apocalyptic number.

161996459 is a deficient number, since it is larger than the sum of its proper divisors (848341).

161996459 is an equidigital number, since it uses as much as digits as its factorization.

161996459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848340.

The product of its digits is 524880, while the sum is 50.

The square root of 161996459 is about 12727.7829569804. The cubic root of 161996459 is about 545.1322059540.

The spelling of 161996459 in words is "one hundred sixty-one million, nine hundred ninety-six thousand, four hundred fifty-nine".