161355361 has 2 divisors, whose sum is σ = 161355362. Its totient is φ = 161355360.

The previous prime is 161355343. The next prime is 161355379. The reversal of 161355361 is 163553161.

It is a balanced prime because it is at equal distance from previous prime (161355343) and next prime (161355379).

It can be written as a sum of positive squares in only one way, i.e., 160807761 + 547600 = 12681^2 + 740^2 .

It is a cyclic number.

It is not a de Polignac number, because 161355361 - 2¹⁵ = 161322593 is a prime.

It is not a weakly prime, because it can be changed into another prime (161355301) 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 as a sum of consecutive naturals, namely, 80677680 + 80677681.

It is an arithmetic number, because the mean of its divisors is an integer number (80677681).

Almost surely, 2^161355361 is an apocalyptic number.

It is an amenable number.

161355361 is a deficient number, since it is larger than the sum of its proper divisors (1).

161355361 is an equidigital number, since it uses as much as digits as its factorization.

161355361 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8100, while the sum is 31.

The square root of 161355361 is about 12702.5730070722. The cubic root of 161355361 is about 544.4121383472.

The spelling of 161355361 in words is "one hundred sixty-one million, three hundred fifty-five thousand, three hundred sixty-one".