161054321 has 2 divisors, whose sum is σ = 161054322. Its totient is φ = 161054320.

The previous prime is 161054291. The next prime is 161054353. The reversal of 161054321 is 123450161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 89567296 + 71487025 = 9464^2 + 8455^2 .

It is an emirp because it is prime and its reverse (123450161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161054321 - 2¹⁴ = 161037937 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is not a weakly prime, because it can be changed into another prime (161054381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80527160 + 80527161.

It is an arithmetic number, because the mean of its divisors is an integer number (80527161).

Almost surely, 2^161054321 is an apocalyptic number.

It is an amenable number.

161054321 is a deficient number, since it is larger than the sum of its proper divisors (1).

161054321 is an equidigital number, since it uses as much as digits as its factorization.

161054321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 161054321 is about 12690.7179071950. The cubic root of 161054321 is about 544.0733584481.

The spelling of 161054321 in words is "one hundred sixty-one million, fifty-four thousand, three hundred twenty-one".