161346553 has 2 divisors, whose sum is σ = 161346554. Its totient is φ = 161346552.

The previous prime is 161346527. The next prime is 161346557. The reversal of 161346553 is 355643161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122943744 + 38402809 = 11088^2 + 6197^2 .

It is a cyclic number.

It is not a de Polignac number, because 161346553 - 2¹³ = 161338361 is a prime.

It is not a weakly prime, because it can be changed into another prime (161346557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80673276 + 80673277.

It is an arithmetic number, because the mean of its divisors is an integer number (80673277).

Almost surely, 2^161346553 is an apocalyptic number.

It is an amenable number.

161346553 is a deficient number, since it is larger than the sum of its proper divisors (1).

161346553 is an equidigital number, since it uses as much as digits as its factorization.

161346553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32400, while the sum is 34.

The square root of 161346553 is about 12702.2263009285. The cubic root of 161346553 is about 544.4022321184.

The spelling of 161346553 in words is "one hundred sixty-one million, three hundred forty-six thousand, five hundred fifty-three".