161994479 has 8 divisors (see below), whose sum is σ = 172397808. Its totient is φ = 151688320.

The previous prime is 161994449. The next prime is 161994487. The reversal of 161994479 is 974499161.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161994479 is a prime.

It is a super-2 number, since 2×161994479² = 52484422452962882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161994449) 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, 20837 + ... + 27534.

It is an arithmetic number, because the mean of its divisors is an integer number (21549726).

Almost surely, 2^161994479 is an apocalyptic number.

161994479 is a deficient number, since it is larger than the sum of its proper divisors (10403329).

161994479 is a wasteful number, since it uses less digits than its factorization.

161994479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48585.

The product of its digits is 489888, while the sum is 50.

The square root of 161994479 is about 12727.7051741467. The cubic root of 161994479 is about 545.1299849874.

The spelling of 161994479 in words is "one hundred sixty-one million, nine hundred ninety-four thousand, four hundred seventy-nine".