161994487 has 2 divisors, whose sum is σ = 161994488. Its totient is φ = 161994486.

The previous prime is 161994449. The next prime is 161994491. The reversal of 161994487 is 784499161.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161994487 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161994487.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161994187) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80997243 + 80997244.

It is an arithmetic number, because the mean of its divisors is an integer number (80997244).

Almost surely, 2^161994487 is an apocalyptic number.

161994487 is a deficient number, since it is larger than the sum of its proper divisors (1).

161994487 is an equidigital number, since it uses as much as digits as its factorization.

161994487 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 435456, while the sum is 49.

The square root of 161994487 is about 12727.7054884217. The cubic root of 161994487 is about 545.1299939611.

The spelling of 161994487 in words is "one hundred sixty-one million, nine hundred ninety-four thousand, four hundred eighty-seven".