161481647 has 4 divisors (see below), whose sum is σ = 162963240. Its totient is φ = 160000056.

The previous prime is 161481637. The next prime is 161481679. The reversal of 161481647 is 746184161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 746184161 = 4561 ⋅163601.

It is a cyclic number.

It is not a de Polignac number, because 161481647 - 2¹⁴ = 161465263 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 161481647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161481637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 740633 + ... + 740850.

It is an arithmetic number, because the mean of its divisors is an integer number (40740810).

Almost surely, 2^161481647 is an apocalyptic number.

161481647 is a deficient number, since it is larger than the sum of its proper divisors (1481593).

161481647 is a wasteful number, since it uses less digits than its factorization.

161481647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481592.

The product of its digits is 32256, while the sum is 38.

The square root of 161481647 is about 12707.5429174959. The cubic root of 161481647 is about 544.5541307428.

The spelling of 161481647 in words is "one hundred sixty-one million, four hundred eighty-one thousand, six hundred forty-seven".