161891416 has 8 divisors (see below), whose sum is σ = 303546420. Its totient is φ = 80945704.

The previous prime is 161891399. The next prime is 161891423. The reversal of 161891416 is 614198161.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10118206 + ... + 10118221.

Almost surely, 2^161891416 is an apocalyptic number.

It is an amenable number.

161891416 is a deficient number, since it is larger than the sum of its proper divisors (141655004).

161891416 is a wasteful number, since it uses less digits than its factorization.

161891416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20236433 (or 20236429 counting only the distinct ones).

The product of its digits is 10368, while the sum is 37.

The square root of 161891416 is about 12723.6557639697. The cubic root of 161891416 is about 545.0143541937.

The spelling of 161891416 in words is "one hundred sixty-one million, eight hundred ninety-one thousand, four hundred sixteen".