161351009 has 2 divisors, whose sum is σ = 161351010. Its totient is φ = 161351008.

The previous prime is 161350999. The next prime is 161351011. The reversal of 161351009 is 900153161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161290000 + 61009 = 12700^2 + 247^2 .

It is an emirp because it is prime and its reverse (900153161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161351009 - 2¹⁶ = 161285473 is a prime.

Together with 161351011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161351089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80675504 + 80675505.

It is an arithmetic number, because the mean of its divisors is an integer number (80675505).

Almost surely, 2^161351009 is an apocalyptic number.

It is an amenable number.

161351009 is a deficient number, since it is larger than the sum of its proper divisors (1).

161351009 is an equidigital number, since it uses as much as digits as its factorization.

161351009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 810, while the sum is 26.

The square root of 161351009 is about 12702.4017020404. The cubic root of 161351009 is about 544.4072437615.

The spelling of 161351009 in words is "one hundred sixty-one million, three hundred fifty-one thousand, nine".