161226011 has 4 divisors (see below), whose sum is σ = 170709912. Its totient is φ = 151742112.

The previous prime is 161225959. The next prime is 161226017. The reversal of 161226011 is 110622161.

161226011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161226011 - 2¹⁴ = 161209627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161226017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4741925 + ... + 4741958.

It is an arithmetic number, because the mean of its divisors is an integer number (42677478).

Almost surely, 2^161226011 is an apocalyptic number.

161226011 is a deficient number, since it is larger than the sum of its proper divisors (9483901).

161226011 is an equidigital number, since it uses as much as digits as its factorization.

161226011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9483900.

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 161226011 is about 12697.4804981146. The cubic root of 161226011 is about 544.2666240502.

Adding to 161226011 its reverse (110622161), we get a palindrome (271848172).

The spelling of 161226011 in words is "one hundred sixty-one million, two hundred twenty-six thousand, eleven".