1216060161 has 8 divisors (see below), whose sum is σ = 1677324480. Its totient is φ = 782751312.

The previous prime is 1216060159. The next prime is 1216060171. The reversal of 1216060161 is 1610606121.

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

It is not a de Polignac number, because 1216060161 - 2¹ = 1216060159 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1216060121) 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, 6988765 + ... + 6988938.

It is an arithmetic number, because the mean of its divisors is an integer number (209665560).

Almost surely, 2^1216060161 is an apocalyptic number.

It is an amenable number.

1216060161 is a deficient number, since it is larger than the sum of its proper divisors (461264319).

1216060161 is a wasteful number, since it uses less digits than its factorization.

1216060161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13977735.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1216060161 is about 34872.0541551541. The cubic root of 1216060161 is about 1067.3782615792.

Adding to 1216060161 its reverse (1610606121), we get a palindrome (2826666282).

The spelling of 1216060161 in words is "one billion, two hundred sixteen million, sixty thousand, one hundred sixty-one".