161989703 has 2 divisors, whose sum is σ = 161989704. Its totient is φ = 161989702.

The previous prime is 161989699. The next prime is 161989721. The reversal of 161989703 is 307989161.

161989703 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (307989161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161989703 - 2² = 161989699 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161989103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80994851 + 80994852.

It is an arithmetic number, because the mean of its divisors is an integer number (80994852).

Almost surely, 2^161989703 is an apocalyptic number.

161989703 is a deficient number, since it is larger than the sum of its proper divisors (1).

161989703 is an equidigital number, since it uses as much as digits as its factorization.

161989703 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 161989703 is about 12727.5175505674. The cubic root of 161989703 is about 545.1246276724.

The spelling of 161989703 in words is "one hundred sixty-one million, nine hundred eighty-nine thousand, seven hundred three".