161649398 has 16 divisors (see below), whose sum is σ = 246309360. Its totient is φ = 79556256.

The previous prime is 161649373. The next prime is 161649401. The reversal of 161649398 is 893946161.

161649398 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161649398² = 52261055747524808, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31865 + ... + 36587.

It is an arithmetic number, because the mean of its divisors is an integer number (15394335).

Almost surely, 2^161649398 is an apocalyptic number.

161649398 is a deficient number, since it is larger than the sum of its proper divisors (84659962).

161649398 is a wasteful number, since it uses less digits than its factorization.

161649398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4991.

The product of its digits is 279936, while the sum is 47.

The square root of 161649398 is about 12714.1416540795. The cubic root of 161649398 is about 544.7426307734.

The spelling of 161649398 in words is "one hundred sixty-one million, six hundred forty-nine thousand, three hundred ninety-eight".