161455213 has 4 divisors (see below), whose sum is σ = 161499388. Its totient is φ = 161411040.

The previous prime is 161455201. The next prime is 161455219. The reversal of 161455213 is 312554161.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42797764 + 118657449 = 6542^2 + 10893^2 .

It is a cyclic number.

It is not a de Polignac number, because 161455213 - 2⁵ = 161455181 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 (161455219) 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, 16056 + ... + 24097.

It is an arithmetic number, because the mean of its divisors is an integer number (40374847).

Almost surely, 2^161455213 is an apocalyptic number.

It is an amenable number.

161455213 is a deficient number, since it is larger than the sum of its proper divisors (44175).

161455213 is an equidigital number, since it uses as much as digits as its factorization.

161455213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44174.

The product of its digits is 3600, while the sum is 28.

The square root of 161455213 is about 12706.5027840079. The cubic root of 161455213 is about 544.5244152309.

The spelling of 161455213 in words is "one hundred sixty-one million, four hundred fifty-five thousand, two hundred thirteen".