161404253 has 2 divisors, whose sum is σ = 161404254. Its totient is φ = 161404252.

The previous prime is 161404223. The next prime is 161404261. The reversal of 161404253 is 352404161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 159087769 + 2316484 = 12613^2 + 1522^2 .

It is a cyclic number.

It is not a de Polignac number, because 161404253 - 2¹⁸ = 161142109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161404213) 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 as a sum of consecutive naturals, namely, 80702126 + 80702127.

It is an arithmetic number, because the mean of its divisors is an integer number (80702127).

Almost surely, 2^161404253 is an apocalyptic number.

It is an amenable number.

161404253 is a deficient number, since it is larger than the sum of its proper divisors (1).

161404253 is an equidigital number, since it uses as much as digits as its factorization.

161404253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 161404253 is about 12704.4973532997. The cubic root of 161404253 is about 544.4671199111.

The spelling of 161404253 in words is "one hundred sixty-one million, four hundred four thousand, two hundred fifty-three".