161825987 has 2 divisors, whose sum is σ = 161825988. Its totient is φ = 161825986.

The previous prime is 161825929. The next prime is 161826001. The reversal of 161825987 is 789528161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161825987 - 2¹⁴ = 161809603 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161825387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80912993 + 80912994.

It is an arithmetic number, because the mean of its divisors is an integer number (80912994).

Almost surely, 2^161825987 is an apocalyptic number.

161825987 is a deficient number, since it is larger than the sum of its proper divisors (1).

161825987 is an equidigital number, since it uses as much as digits as its factorization.

161825987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 47.

The square root of 161825987 is about 12721.0843484351. The cubic root of 161825987 is about 544.9409211273.

The spelling of 161825987 in words is "one hundred sixty-one million, eight hundred twenty-five thousand, nine hundred eighty-seven".