161306461 has 4 divisors (see below), whose sum is σ = 161739292. Its totient is φ = 160873632.

The previous prime is 161306449. The next prime is 161306473. The reversal of 161306461 is 164603161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 164603161 = 593 ⋅277577.

It is an interprime number because it is at equal distance from previous prime (161306449) and next prime (161306473).

It can be written as a sum of positive squares in 2 ways, for example, as 48734361 + 112572100 = 6981^2 + 10610^2 .

It is a cyclic number.

It is not a de Polignac number, because 161306461 - 2¹⁷ = 161175389 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 (161316461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215856 + ... + 216601.

It is an arithmetic number, because the mean of its divisors is an integer number (40434823).

Almost surely, 2^161306461 is an apocalyptic number.

It is an amenable number.

161306461 is a deficient number, since it is larger than the sum of its proper divisors (432831).

161306461 is an equidigital number, since it uses as much as digits as its factorization.

161306461 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432830.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 161306461 is about 12700.6480543317. The cubic root of 161306461 is about 544.3571366764.

The spelling of 161306461 in words is "one hundred sixty-one million, three hundred six thousand, four hundred sixty-one".