161231436 has 36 divisors (see below), whose sum is σ = 408189600. Its totient is φ = 53660448.

The previous prime is 161231431. The next prime is 161231437. The reversal of 161231436 is 634132161.

161231436 is a `hidden beast` number, since 1 + 612 + 3 + 1 + 43 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (161231431) 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, 22770 + ... + 28998.

It is an arithmetic number, because the mean of its divisors is an integer number (11338600).

Almost surely, 2^161231436 is an apocalyptic number.

It is an amenable number.

161231436 is an abundant number, since it is smaller than the sum of its proper divisors (246958164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161231436 is a wasteful number, since it uses less digits than its factorization.

161231436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6958 (or 6953 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 161231436 is about 12697.6941213750. The cubic root of 161231436 is about 544.2727285518.

Adding to 161231436 its reverse (634132161), we get a palindrome (795363597).

The spelling of 161231436 in words is "one hundred sixty-one million, two hundred thirty-one thousand, four hundred thirty-six".