161263133 has 2 divisors, whose sum is σ = 161263134. Its totient is φ = 161263132.

The previous prime is 161263073. The next prime is 161263163. The reversal of 161263133 is 331362161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 146845924 + 14417209 = 12118^2 + 3797^2 .

It is a cyclic number.

It is not a de Polignac number, because 161263133 - 2¹⁰ = 161262109 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161263163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80631566 + 80631567.

It is an arithmetic number, because the mean of its divisors is an integer number (80631567).

Almost surely, 2^161263133 is an apocalyptic number.

It is an amenable number.

161263133 is a deficient number, since it is larger than the sum of its proper divisors (1).

161263133 is an equidigital number, since it uses as much as digits as its factorization.

161263133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 26.

The square root of 161263133 is about 12698.9422000417. The cubic root of 161263133 is about 544.3083929828.

The spelling of 161263133 in words is "one hundred sixty-one million, two hundred sixty-three thousand, one hundred thirty-three".