161015712 has 192 divisors, whose sum is σ = 511588224. Its totient is φ = 43683840.

The previous prime is 161015711. The next prime is 161015737. The reversal of 161015712 is 217510161.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (161015711) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 507778 + ... + 508094.

It is an arithmetic number, because the mean of its divisors is an integer number (2664522).

Almost surely, 2^161015712 is an apocalyptic number.

161015712 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 161015712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (255794112).

161015712 is an abundant number, since it is smaller than the sum of its proper divisors (350572512).

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

161015712 is a wasteful number, since it uses less digits than its factorization.

161015712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 420, while the sum is 24.

The square root of 161015712 is about 12689.1966648799. The cubic root of 161015712 is about 544.0298786934.

Adding to 161015712 its reverse (217510161), we get a palindrome (378525873).

The spelling of 161015712 in words is "one hundred sixty-one million, fifteen thousand, seven hundred twelve".