161505369 has 12 divisors (see below), whose sum is σ = 237110692. Its totient is φ = 105904800.

The previous prime is 161505359. The next prime is 161505397. The reversal of 161505369 is 963505161.

161505369 is a `hidden beast` number, since 1 + 615 + 0 + 5 + 36 + 9 = 666.

161505369 is nontrivially palindromic in base 2.

It can be written as a sum of positive squares in 2 ways, for example, as 67026969 + 94478400 = 8187^2 + 9720^2 .

It is not a de Polignac number, because 161505369 - 2⁴ = 161505353 is a prime.

It is a super-2 number, since 2×161505369² = 52167968431652322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161505349) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 146542 + ... + 147639.

Almost surely, 2^161505369 is an apocalyptic number.

It is an amenable number.

161505369 is a deficient number, since it is larger than the sum of its proper divisors (75605323).

161505369 is a wasteful number, since it uses less digits than its factorization.

161505369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294248 (or 294245 counting only the distinct ones).

The product of its (nonzero) digits is 24300, while the sum is 36.

The square root of 161505369 is about 12708.4762658629. The cubic root of 161505369 is about 544.5807948268.

The spelling of 161505369 in words is "one hundred sixty-one million, five hundred five thousand, three hundred sixty-nine".