161226779 has 16 divisors (see below), whose sum is σ = 188740608. Its totient is φ = 134851392.

The previous prime is 161226743. The next prime is 161226787. The reversal of 161226779 is 977622161.

161226779 = T₂ + T₃ + ... + T₉₈₈.

It is a cyclic number.

It is not a de Polignac number, because 161226779 - 2²⁴ = 144449563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161226739) 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 in 15 ways as a sum of consecutive naturals, for example, 171599 + ... + 172535.

It is an arithmetic number, because the mean of its divisors is an integer number (11796288).

Almost surely, 2^161226779 is an apocalyptic number.

161226779 is a deficient number, since it is larger than the sum of its proper divisors (27513829).

161226779 is an equidigital number, since it uses as much as digits as its factorization.

161226779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514.

The product of its digits is 63504, while the sum is 41.

The square root of 161226779 is about 12697.5107402987. The cubic root of 161226779 is about 544.2674882534.

The spelling of 161226779 in words is "one hundred sixty-one million, two hundred twenty-six thousand, seven hundred seventy-nine".