161398699 has 24 divisors (see below), whose sum is σ = 210379248. Its totient is φ = 122351040.

The previous prime is 161398687. The next prime is 161398709. The reversal of 161398699 is 996893161.

It is not a de Polignac number, because 161398699 - 2⁵ = 161398667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161398499) 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 in 23 ways as a sum of consecutive naturals, for example, 15897 + ... + 23989.

It is an arithmetic number, because the mean of its divisors is an integer number (8765802).

Almost surely, 2^161398699 is an apocalyptic number.

161398699 is a deficient number, since it is larger than the sum of its proper divisors (48980549).

161398699 is a wasteful number, since it uses less digits than its factorization.

161398699 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8155 (or 8148 counting only the distinct ones).

The product of its digits is 629856, while the sum is 52.

The square root of 161398699 is about 12704.2787674075. The cubic root of 161398699 is about 544.4608747120.

The spelling of 161398699 in words is "one hundred sixty-one million, three hundred ninety-eight thousand, six hundred ninety-nine".