216161398 has 4 divisors (see below), whose sum is σ = 324242100. Its totient is φ = 108080698.

The previous prime is 216161377. The next prime is 216161411. The reversal of 216161398 is 893161612.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54040348 + ... + 54040351.

It is an arithmetic number, because the mean of its divisors is an integer number (81060525).

Almost surely, 2^216161398 is an apocalyptic number.

216161398 is a deficient number, since it is larger than the sum of its proper divisors (108080702).

216161398 is a wasteful number, since it uses less digits than its factorization.

216161398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108080701.

The product of its digits is 15552, while the sum is 37.

The square root of 216161398 is about 14702.4283028349. The cubic root of 216161398 is about 600.1494053862.

The spelling of 216161398 in words is "two hundred sixteen million, one hundred sixty-one thousand, three hundred ninety-eight".