1211162178 has 16 divisors (see below), whose sum is σ = 2564814240. Its totient is φ = 379972416.

The previous prime is 1211162081. The next prime is 1211162179. The reversal of 1211162178 is 8712611121.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211162179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5936968 + ... + 5937171.

It is an arithmetic number, because the mean of its divisors is an integer number (160300890).

Almost surely, 2^1211162178 is an apocalyptic number.

1211162178 is an abundant number, since it is smaller than the sum of its proper divisors (1353652062).

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

1211162178 is a wasteful number, since it uses less digits than its factorization.

1211162178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11874161.

The product of its digits is 1344, while the sum is 30.

The square root of 1211162178 is about 34801.7553867617. The cubic root of 1211162178 is about 1065.9432899887.

Adding to 1211162178 its reverse (8712611121), we get a palindrome (9923773299).

The spelling of 1211162178 in words is "one billion, two hundred eleven million, one hundred sixty-two thousand, one hundred seventy-eight".