161151509 has 2 divisors, whose sum is σ = 161151510. Its totient is φ = 161151508.

The previous prime is 161151503. The next prime is 161151511. The reversal of 161151509 is 905151161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146482609 + 14668900 = 12103^2 + 3830^2 .

It is a cyclic number.

It is not a de Polignac number, because 161151509 - 2⁸ = 161151253 is a prime.

Together with 161151511, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161151503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80575754 + 80575755.

It is an arithmetic number, because the mean of its divisors is an integer number (80575755).

Almost surely, 2^161151509 is an apocalyptic number.

It is an amenable number.

161151509 is a deficient number, since it is larger than the sum of its proper divisors (1).

161151509 is an equidigital number, since it uses as much as digits as its factorization.

161151509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1350, while the sum is 29.

The square root of 161151509 is about 12694.5464275019. The cubic root of 161151509 is about 544.1827765387.

The spelling of 161151509 in words is "one hundred sixty-one million, one hundred fifty-one thousand, five hundred nine".