161315712 has 80 divisors (see below), whose sum is σ = 480103800. Its totient is φ = 53768448.

The previous prime is 161315711. The next prime is 161315743. The reversal of 161315712 is 217513161.

161315712 is a `hidden beast` number, since 1 + 61 + 31 + 571 + 2 = 666.

161315712 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161315711) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2589 + ... + 18147.

Almost surely, 2^161315712 is an apocalyptic number.

161315712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161315712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240051900).

161315712 is an abundant number, since it is smaller than the sum of its proper divisors (318788088).

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

161315712 is an equidigital number, since it uses as much as digits as its factorization.

161315712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15585 (or 15564 counting only the distinct ones).

The product of its digits is 1260, while the sum is 27.

The square root of 161315712 is about 12701.0122431246. The cubic root of 161315712 is about 544.3675428551.

Adding to 161315712 its reverse (217513161), we get a palindrome (378828873).

The spelling of 161315712 in words is "one hundred sixty-one million, three hundred fifteen thousand, seven hundred twelve".