161350261 has 4 divisors (see below), whose sum is σ = 169842400. Its totient is φ = 152858124.

The previous prime is 161350183. The next prime is 161350279. The reversal of 161350261 is 162053161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 162053161 = 1213 ⋅133597.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161350261 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 (161350291) 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 3 ways as a sum of consecutive naturals, for example, 4246041 + ... + 4246078.

It is an arithmetic number, because the mean of its divisors is an integer number (42460600).

Almost surely, 2^161350261 is an apocalyptic number.

It is an amenable number.

161350261 is a deficient number, since it is larger than the sum of its proper divisors (8492139).

161350261 is an equidigital number, since it uses as much as digits as its factorization.

161350261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492138.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 161350261 is about 12702.3722587554. The cubic root of 161350261 is about 544.4064024957.

The spelling of 161350261 in words is "one hundred sixty-one million, three hundred fifty thousand, two hundred sixty-one".