161941247 has 4 divisors (see below), whose sum is σ = 174398280. Its totient is φ = 149484216.

The previous prime is 161941177. The next prime is 161941259. The reversal of 161941247 is 742149161.

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

It is a cyclic number.

It is not a de Polignac number, because 161941247 - 2¹⁰ = 161940223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161941147) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6228497 + ... + 6228522.

It is an arithmetic number, because the mean of its divisors is an integer number (43599570).

Almost surely, 2^161941247 is an apocalyptic number.

161941247 is a deficient number, since it is larger than the sum of its proper divisors (12457033).

161941247 is a wasteful number, since it uses less digits than its factorization.

161941247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12457032.

The product of its digits is 12096, while the sum is 35.

The square root of 161941247 is about 12725.6138162369. The cubic root of 161941247 is about 545.0702678526.

The spelling of 161941247 in words is "one hundred sixty-one million, nine hundred forty-one thousand, two hundred forty-seven".