161505499 has 2 divisors, whose sum is σ = 161505500. Its totient is φ = 161505498.

The previous prime is 161505497. The next prime is 161505521. The reversal of 161505499 is 994505161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161505499 - 2¹ = 161505497 is a prime.

Together with 161505497, 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 (161505497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80752749 + 80752750.

It is an arithmetic number, because the mean of its divisors is an integer number (80752750).

Almost surely, 2^161505499 is an apocalyptic number.

161505499 is a deficient number, since it is larger than the sum of its proper divisors (1).

161505499 is an equidigital number, since it uses as much as digits as its factorization.

161505499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48600, while the sum is 40.

The square root of 161505499 is about 12708.4813805584. The cubic root of 161505499 is about 544.5809409426.

The spelling of 161505499 in words is "one hundred sixty-one million, five hundred five thousand, four hundred ninety-nine".