161356212 has 30 divisors (see below), whose sum is σ = 421817858. Its totient is φ = 53785296.

The previous prime is 161356193. The next prime is 161356213. The reversal of 161356212 is 212653161.

161356212 is a `hidden beast` number, since 1 + 6 + 1 + 35 + 621 + 2 = 666.

161356212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 133541136 + 27815076 = 11556^2 + 5274^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161356213) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 248683 + ... + 249330.

Almost surely, 2^161356212 is an apocalyptic number.

161356212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

161356212 is an abundant number, since it is smaller than the sum of its proper divisors (260461646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161356212 is a wasteful number, since it uses less digits than its factorization.

161356212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498029 (or 498018 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 161356212 is about 12702.6065041786. The cubic root of 161356212 is about 544.4130954353.

The spelling of 161356212 in words is "one hundred sixty-one million, three hundred fifty-six thousand, two hundred twelve".