161649359 has 16 divisors (see below), whose sum is σ = 180238080. Its totient is φ = 144270720.

The previous prime is 161649353. The next prime is 161649373. The reversal of 161649359 is 953946161.

161649359 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161649359 - 2¹⁶ = 161583823 is a prime.

It is a super-2 number, since 2×161649359² = 52261030530221762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161649353) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26519 + ... + 32039.

It is an arithmetic number, because the mean of its divisors is an integer number (11264880).

Almost surely, 2^161649359 is an apocalyptic number.

161649359 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

161649359 is a deficient number, since it is larger than the sum of its proper divisors (18588721).

161649359 is a wasteful number, since it uses less digits than its factorization.

161649359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5630.

The product of its digits is 174960, while the sum is 44.

The square root of 161649359 is about 12714.1401203542. The cubic root of 161649359 is about 544.7425869647.

The spelling of 161649359 in words is "one hundred sixty-one million, six hundred forty-nine thousand, three hundred fifty-nine".