161245247 has 4 divisors (see below), whose sum is σ = 163454160. Its totient is φ = 159036336.

The previous prime is 161245211. The next prime is 161245283. The reversal of 161245247 is 742542161.

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

It is an interprime number because it is at equal distance from previous prime (161245211) and next prime (161245283).

It is a cyclic number.

It is not a de Polignac number, because 161245247 - 2⁸ = 161244991 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 (161245547) 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, 1104347 + ... + 1104492.

It is an arithmetic number, because the mean of its divisors is an integer number (40863540).

Almost surely, 2^161245247 is an apocalyptic number.

161245247 is a deficient number, since it is larger than the sum of its proper divisors (2208913).

161245247 is an equidigital number, since it uses as much as digits as its factorization.

161245247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2208912.

The product of its digits is 13440, while the sum is 32.

The square root of 161245247 is about 12698.2379486289. The cubic root of 161245247 is about 544.2882688133.

The spelling of 161245247 in words is "one hundred sixty-one million, two hundred forty-five thousand, two hundred forty-seven".