161716491 has 12 divisors (see below), whose sum is σ = 241126080. Its totient is φ = 104333040.

The previous prime is 161716469. The next prime is 161716501. The reversal of 161716491 is 194617161.

161716491 is a `hidden beast` number, since 1 + 6 + 1 + 7 + 1 + 649 + 1 = 666.

It is not a de Polignac number, because 161716491 - 2⁵ = 161716459 is a prime.

It is a super-2 number, since 2×161716491² = 52304446922706162, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161716691) 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 11 ways as a sum of consecutive naturals, for example, 289536 + ... + 290093.

It is an arithmetic number, because the mean of its divisors is an integer number (20093840).

Almost surely, 2^161716491 is an apocalyptic number.

161716491 is a deficient number, since it is larger than the sum of its proper divisors (79409589).

161716491 is a wasteful number, since it uses less digits than its factorization.

161716491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 579666 (or 579663 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 161716491 is about 12716.7798990153. The cubic root of 161716491 is about 544.8179859607.

The spelling of 161716491 in words is "one hundred sixty-one million, seven hundred sixteen thousand, four hundred ninety-one".