1211270161 has 8 divisors (see below), whose sum is σ = 1251790848. Its totient is φ = 1170840000.

The previous prime is 1211270149. The next prime is 1211270167. The reversal of 1211270161 is 1610721121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1211270161 - 2⁷ = 1211270033 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211270167) 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, 5136 + ... + 49486.

It is an arithmetic number, because the mean of its divisors is an integer number (156473856).

Almost surely, 2^1211270161 is an apocalyptic number.

It is an amenable number.

1211270161 is a deficient number, since it is larger than the sum of its proper divisors (40520687).

1211270161 is an equidigital number, since it uses as much as digits as its factorization.

1211270161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45263.

The product of its (nonzero) digits is 168, while the sum is 22.

The square root of 1211270161 is about 34803.3067538129. The cubic root of 1211270161 is about 1065.9749676440.

Adding to 1211270161 its reverse (1610721121), we get a palindrome (2821991282).

The spelling of 1211270161 in words is "one billion, two hundred eleven million, two hundred seventy thousand, one hundred sixty-one".