161748787 has 8 divisors (see below), whose sum is σ = 166246400. Its totient is φ = 157312584.

The previous prime is 161748781. The next prime is 161748791. The reversal of 161748787 is 787847161.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161748787 - 2¹⁹ = 161224499 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 161748787.

It is not an unprimeable number, because it can be changed into a prime (161748781) 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 7 ways as a sum of consecutive naturals, for example, 9987 + ... + 20572.

It is an arithmetic number, because the mean of its divisors is an integer number (20780800).

Almost surely, 2^161748787 is an apocalyptic number.

161748787 is a deficient number, since it is larger than the sum of its proper divisors (4497613).

161748787 is an equidigital number, since it uses as much as digits as its factorization.

161748787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30705.

The product of its digits is 526848, while the sum is 49.

The square root of 161748787 is about 12718.0496539367. The cubic root of 161748787 is about 544.8542516303.

The spelling of 161748787 in words is "one hundred sixty-one million, seven hundred forty-eight thousand, seven hundred eighty-seven".