161498009 has 2 divisors, whose sum is σ = 161498010. Its totient is φ = 161498008.

The previous prime is 161497991. The next prime is 161498033. The reversal of 161498009 is 900894161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154753600 + 6744409 = 12440^2 + 2597^2 .

It is a cyclic number.

It is not a de Polignac number, because 161498009 - 2⁸ = 161497753 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161498059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80749004 + 80749005.

It is an arithmetic number, because the mean of its divisors is an integer number (80749005).

Almost surely, 2^161498009 is an apocalyptic number.

It is an amenable number.

161498009 is a deficient number, since it is larger than the sum of its proper divisors (1).

161498009 is an equidigital number, since it uses as much as digits as its factorization.

161498009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 161498009 is about 12708.1866920501. The cubic root of 161498009 is about 544.5725222936.

The spelling of 161498009 in words is "one hundred sixty-one million, four hundred ninety-eight thousand, nine".