161247703 has 4 divisors (see below), whose sum is σ = 170732880. Its totient is φ = 151762528.

The previous prime is 161247679. The next prime is 161247707. The reversal of 161247703 is 307742161.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161247703 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 (161247707) 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, 4742563 + ... + 4742596.

It is an arithmetic number, because the mean of its divisors is an integer number (42683220).

Almost surely, 2^161247703 is an apocalyptic number.

161247703 is a deficient number, since it is larger than the sum of its proper divisors (9485177).

161247703 is an equidigital number, since it uses as much as digits as its factorization.

161247703 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9485176.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 161247703 is about 12698.3346545915. The cubic root of 161247703 is about 544.2910322337.

Adding to 161247703 its reverse (307742161), we get a palindrome (468989864).

The spelling of 161247703 in words is "one hundred sixty-one million, two hundred forty-seven thousand, seven hundred three".