161872703 has 4 divisors (see below), whose sum is σ = 163385640. Its totient is φ = 160359768.

The previous prime is 161872699. The next prime is 161872709. The reversal of 161872703 is 307278161.

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 161872703 - 2² = 161872699 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161872709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 756308 + ... + 756521.

It is an arithmetic number, because the mean of its divisors is an integer number (40846410).

Almost surely, 2^161872703 is an apocalyptic number.

161872703 is a deficient number, since it is larger than the sum of its proper divisors (1512937).

161872703 is a wasteful number, since it uses less digits than its factorization.

161872703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512936.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 161872703 is about 12722.9203801643. The cubic root of 161872703 is about 544.9933540137.

The spelling of 161872703 in words is "one hundred sixty-one million, eight hundred seventy-two thousand, seven hundred three".