161222741 has 2 divisors, whose sum is σ = 161222742. Its totient is φ = 161222740.

The previous prime is 161222693. The next prime is 161222791. The reversal of 161222741 is 147222161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 144240100 + 16982641 = 12010^2 + 4121^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161222741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161222741.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161222791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80611370 + 80611371.

It is an arithmetic number, because the mean of its divisors is an integer number (80611371).

Almost surely, 2^161222741 is an apocalyptic number.

It is an amenable number.

161222741 is a deficient number, since it is larger than the sum of its proper divisors (1).

161222741 is an equidigital number, since it uses as much as digits as its factorization.

161222741 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1344, while the sum is 26.

The square root of 161222741 is about 12697.3517317589. The cubic root of 161222741 is about 544.2629444043.

The spelling of 161222741 in words is "one hundred sixty-one million, two hundred twenty-two thousand, seven hundred forty-one".