161627121 has 12 divisors (see below), whose sum is σ = 241512180. Its totient is φ = 104035680.

The previous prime is 161627119. The next prime is 161627131. The reversal of 161627121 is 121726161.

It is a happy number.

161627121 is a `hidden beast` number, since 1 + 616 + 27 + 1 + 21 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 81703521 + 79923600 = 9039^2 + 8940^2 .

It is not a de Polignac number, because 161627121 - 2¹ = 161627119 is a prime.

It is a super-2 number, since 2×161627121² = 52246652485497282, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161627111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 309370 + ... + 309891.

It is an arithmetic number, because the mean of its divisors is an integer number (20126015).

Almost surely, 2^161627121 is an apocalyptic number.

It is an amenable number.

161627121 is a deficient number, since it is larger than the sum of its proper divisors (79885059).

161627121 is a wasteful number, since it uses less digits than its factorization.

161627121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619296 (or 619293 counting only the distinct ones).

The product of its digits is 1008, while the sum is 27.

The square root of 161627121 is about 12713.2655521703. The cubic root of 161627121 is about 544.7176058548.

The spelling of 161627121 in words is "one hundred sixty-one million, six hundred twenty-seven thousand, one hundred twenty-one".