161247701 has 4 divisors (see below), whose sum is σ = 161273100. Its totient is φ = 161222304.

The previous prime is 161247679. The next prime is 161247707. The reversal of 161247701 is 107742161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 107742161 = 811 ⋅132851.

It can be written as a sum of positive squares in 2 ways, for example, as 148474225 + 12773476 = 12185^2 + 3574^2 .

It is a cyclic number.

It is not a de Polignac number, because 161247701 - 2¹⁰ = 161246677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161247707) 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, 6155 + ... + 18983.

It is an arithmetic number, because the mean of its divisors is an integer number (40318275).

Almost surely, 2^161247701 is an apocalyptic number.

It is an amenable number.

161247701 is a deficient number, since it is larger than the sum of its proper divisors (25399).

161247701 is a wasteful number, since it uses less digits than its factorization.

161247701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25398.

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 161247701 is about 12698.3345758410. The cubic root of 161247701 is about 544.2910299834.

Adding to 161247701 its reverse (107742161), we get a palindrome (268989862).

The spelling of 161247701 in words is "one hundred sixty-one million, two hundred forty-seven thousand, seven hundred one".