161798887 has 2 divisors, whose sum is σ = 161798888. Its totient is φ = 161798886.

The previous prime is 161798807. The next prime is 161798893. The reversal of 161798887 is 788897161.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161798887 - 2⁷ = 161798759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161798807) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80899443 + 80899444.

It is an arithmetic number, because the mean of its divisors is an integer number (80899444).

Almost surely, 2^161798887 is an apocalyptic number.

161798887 is a deficient number, since it is larger than the sum of its proper divisors (1).

161798887 is an equidigital number, since it uses as much as digits as its factorization.

161798887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1354752, while the sum is 55.

The square root of 161798887 is about 12720.0191430674. The cubic root of 161798887 is about 544.9105001307.

The spelling of 161798887 in words is "one hundred sixty-one million, seven hundred ninety-eight thousand, eight hundred eighty-seven".