161228405 has 16 divisors (see below), whose sum is σ = 210008064. Its totient is φ = 118117440.

The previous prime is 161228401. The next prime is 161228411. The reversal of 161228405 is 504822161.

161228405 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161228405 - 2² = 161228401 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161228401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1511 + ... + 18020.

It is an arithmetic number, because the mean of its divisors is an integer number (13125504).

Almost surely, 2^161228405 is an apocalyptic number.

It is an amenable number.

161228405 is a deficient number, since it is larger than the sum of its proper divisors (48779659).

161228405 is a wasteful number, since it uses less digits than its factorization.

161228405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19676.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 161228405 is about 12697.5747684351. The cubic root of 161228405 is about 544.2693179246.

The spelling of 161228405 in words is "one hundred sixty-one million, two hundred twenty-eight thousand, four hundred five".