161203898 has 4 divisors (see below), whose sum is σ = 241805850. Its totient is φ = 80601948.

The previous prime is 161203897. The next prime is 161203919. The reversal of 161203898 is 898302161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 99062209 + 62141689 = 9953^2 + 7883^2 .

It is not an unprimeable number, because it can be changed into a prime (161203891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40300973 + ... + 40300976.

Almost surely, 2^161203898 is an apocalyptic number.

161203898 is a deficient number, since it is larger than the sum of its proper divisors (80601952).

161203898 is an equidigital number, since it uses as much as digits as its factorization.

161203898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80601951.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 161203898 is about 12696.6097049567. The cubic root of 161203898 is about 544.2417398973.

The spelling of 161203898 in words is "one hundred sixty-one million, two hundred three thousand, eight hundred ninety-eight".