161810699 has 2 divisors, whose sum is σ = 161810700. Its totient is φ = 161810698.

The previous prime is 161810683. The next prime is 161810711. The reversal of 161810699 is 996018161.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (996018161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161810699 - 2⁴ = 161810683 is a prime.

It is not a weakly prime, because it can be changed into another prime (161810599) 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, 80905349 + 80905350.

It is an arithmetic number, because the mean of its divisors is an integer number (80905350).

Almost surely, 2^161810699 is an apocalyptic number.

161810699 is a deficient number, since it is larger than the sum of its proper divisors (1).

161810699 is an equidigital number, since it uses as much as digits as its factorization.

161810699 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 161810699 is about 12720.4834420709. The cubic root of 161810699 is about 544.9237600617.

The spelling of 161810699 in words is "one hundred sixty-one million, eight hundred ten thousand, six hundred ninety-nine".