161015427 has 12 divisors (see below), whose sum is σ = 232690744. Its totient is φ = 107291520.

The previous prime is 161015423. The next prime is 161015429. The reversal of 161015427 is 724510161.

It is a happy number.

161015427 is a `hidden beast` number, since 1 + 610 + 1 + 5 + 42 + 7 = 666.

It is not a de Polignac number, because 161015427 - 2² = 161015423 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161015427.

It is not an unprimeable number, because it can be changed into a prime (161015423) 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 11 ways as a sum of consecutive naturals, for example, 27588 + ... + 32910.

Almost surely, 2^161015427 is an apocalyptic number.

161015427 is a deficient number, since it is larger than the sum of its proper divisors (71675317).

161015427 is a wasteful number, since it uses less digits than its factorization.

161015427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8690 (or 8687 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 161015427 is about 12689.1854348496. The cubic root of 161015427 is about 544.0295577131.

Adding to 161015427 its reverse (724510161), we get a palindrome (885525588).

It can be divided in two parts, 16101 and 5427, that added together give a triangular number (21528 = T₂₀₇).

The spelling of 161015427 in words is "one hundred sixty-one million, fifteen thousand, four hundred twenty-seven".