1212165163 has 4 divisors (see below), whose sum is σ = 1322362008. Its totient is φ = 1101968320.

The previous prime is 1212165151. The next prime is 1212165169. The reversal of 1212165163 is 3615612121.

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 1212165163 - 2²¹ = 1210068011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1212165169) 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, 55098406 + ... + 55098427.

It is an arithmetic number, because the mean of its divisors is an integer number (330590502).

Almost surely, 2^1212165163 is an apocalyptic number.

1212165163 is a deficient number, since it is larger than the sum of its proper divisors (110196845).

1212165163 is a wasteful number, since it uses less digits than its factorization.

1212165163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110196844.

The product of its digits is 2160, while the sum is 28.

The square root of 1212165163 is about 34816.1623818594. The cubic root of 1212165163 is about 1066.2374510200.

Adding to 1212165163 its reverse (3615612121), we get a palindrome (4827777284).

It can be divided in two parts, 12121 and 65163, that added together give a square (77284 = 278²).

The spelling of 1212165163 in words is "one billion, two hundred twelve million, one hundred sixty-five thousand, one hundred sixty-three".