161523369 has 16 divisors (see below), whose sum is σ = 273479040. Its totient is φ = 92298960.

The previous prime is 161523343. The next prime is 161523379. The reversal of 161523369 is 963325161.

161523369 is a `hidden beast` number, since 1 + 615 + 2 + 3 + 36 + 9 = 666.

It is not a de Polignac number, because 161523369 - 2¹² = 161519273 is a prime.

It is a super-2 number, since 2×161523369² = 52179597466220322, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (161523379) 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, 427122 + ... + 427499.

It is an arithmetic number, because the mean of its divisors is an integer number (17092440).

Almost surely, 2^161523369 is an apocalyptic number.

It is an amenable number.

161523369 is a deficient number, since it is larger than the sum of its proper divisors (111955671).

161523369 is an equidigital number, since it uses as much as digits as its factorization.

161523369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854637 (or 854631 counting only the distinct ones).

The product of its digits is 29160, while the sum is 36.

The square root of 161523369 is about 12709.1844348880. The cubic root of 161523369 is about 544.6010255064.

It can be divided in two parts, 16 and 1523369, that added together give a triangular number (1523385 = T₁₇₄₅).

The spelling of 161523369 in words is "one hundred sixty-one million, five hundred twenty-three thousand, three hundred sixty-nine".