161073509 has 2 divisors, whose sum is σ = 161073510. Its totient is φ = 161073508.

The previous prime is 161073491. The next prime is 161073541. The reversal of 161073509 is 905370161.

161073509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (161073541) can be obtained adding 161073509 to its sum of digits (32).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 137405284 + 23668225 = 11722^2 + 4865^2 .

It is a cyclic number.

It is not a de Polignac number, because 161073509 - 2¹² = 161069413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161073109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80536754 + 80536755.

It is an arithmetic number, because the mean of its divisors is an integer number (80536755).

Almost surely, 2^161073509 is an apocalyptic number.

It is an amenable number.

161073509 is a deficient number, since it is larger than the sum of its proper divisors (1).

161073509 is an equidigital number, since it uses as much as digits as its factorization.

161073509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5670, while the sum is 32.

The square root of 161073509 is about 12691.4738702800. The cubic root of 161073509 is about 544.0949645434.

The spelling of 161073509 in words is "one hundred sixty-one million, seventy-three thousand, five hundred nine".